Bidders Library Interoperability Test and Evaluation - DOD AS-SIP 2013.pdf

Department of Defense

Assured Services (AS) Session Initiation Protocol (SIP) 2013

(AS-SIP 2013) Change 1

June 2015

The Office of the DoD Chief Information Officer

DEPARTMENT OF DEFENSE

ASSURED SERVICES SESSION INITIATION PROTOCOL 2013 (AS-SIP 2013)

Change 1

DoD AS-SIP 2013 Change 1 Changes Table i

AS-SIP 2013, Changes Table

VERSION

REQ-ID

CHANGE

EFFECTIVE

DATE

Errata 1 SIP-000005 Added an optional requirement for SC interoperability AS-SIP line side interface and the capability to service AS-SIP EIs. Immediate

Errata 1 SIP-000056 Added an optional requirement for the SC to keep track of the EI category. Immediate

Errata 1 SIP-000057 Added requirement for when an SC receives and initial INVITE or a REFER from a served AS-SIP EI and the Initial INVITE or REFER doesn’t include a Resource-Priority header field.

Immediate

Errata 1 SIP-000058 Added requirement for when an SC receives a re-INVITE or UPDATE from a served AS-SIP EI that does not include a Resource-Priority header field.

Immediate

Errata 1 SIP-004340 Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-004340.a Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-004350 Added qualifier “or on behalf of a served RO AS-SIP EI”. Immediate Errata 1 SIP-004350.a Added qualifier “or on behalf of a served RO AS-SIP EI”. Immediate Errata 1 SIP-004360 Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-004360.a Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-004390 Changed “UC-SIP EI” to “AS-SIP EI with P&P". Immediate Errata 1 SIP-004440 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004474 Added a requirement for when an SC receives an INVITE, UPDATE or REFER request from a served AS-SIP EI that does not contain a Resource-Priority header field.

Immediate

Errata 1 SIP-004476 Added a requirement for when an SC receives an initial INVITE from a served AS-SIP EI in which the value of the precedence digit signifies a call priority greater than ‘routine’.

Immediate

Errata 1 SIP-004478 Added a requirement for when an SC receives an initial INVITE from a served RO AS-SIP EI in which the value of the precedence digit signifies a call priority greater than ‘routine.

Immediate

Errata 1 SIP-004490 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004500 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004510 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004520 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004530 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004530.a Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004530.b Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004540 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004550 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004560 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004570 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004580 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004610, SIP-004630

Clarified requirement to include “to support the ability to generate and to receive/process”. Immediate ii

Errata 1 SIP-004635 Added requirement when an RO AS-SIP EI receives a Request with a Require heading having a “resource-priority” option tag. Immediate

Errata 1 SIP-004660 Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-004660.a Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-004660.b Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-004660.c Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-004670 Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-004670.a Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-004670.b Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-004670.c Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-004720 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004730.a Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004780 Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-004820 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004820.a Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-004860 Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-005010.a Clarified behavior of a proprietary IP EI and RO AS-SIP EI. Immediate Errata 1 SIP-005010.b Clarified requirement is for an EI that support endpoint preemption. Immediate

Errata 1 SIP-005010.c Clarified requirement is for an EI that support endpoint preemption. Immediate

Errata 1 SIP- 005010.c.2

Clarified to describe different types of EIs. Immediate

Errata 1 SIP-005020 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-005100 Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-005110 Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-005120 Clarified to describe different types of EIs. Immediate Errata 1 SIP-005150 Clarified to describe different types of EIs. Immediate Errata 1 SIP-005190 Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-005210 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-005230 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-005240.b Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-005240.c Clarified to describe different types of EIs. Immediate Errata 1 SIP-005250 Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-005250.a Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-005250.b Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-005250.c Specified [Required: AS-SIP EIs with P&P]. Clarified to describe different types of EIs. Immediate

Errata 1 SIP-005250.d Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-005250.e Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-005260 Clarified to describe different types of EIs. Immediate Errata 1 SIP-005260.b Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-005260.c Clarified to describe different types of EIs. Immediate Errata 1 SIP-005270 Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-005270.a Specified [Required: AS-SIP EIs with P&P]. Immediate iii

Errata 1 SIP-005270.b Specified [Required: AS-SIP EIs with P&P]. Changed “AS-SIP

EI” to AS-SIP EI with P&P. Immediate

Errata 1 SIP-005270.c Specified [Required: AS-SIP EIs with P&P]. Clarified to describe different types of EIs. Immediate

Errata 1 SIP-005270.d Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-005270.e Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-005280.b Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-005280.c Clarified to describe different types of EIs. Immediate Errata 1 SIP-005280.d Clarified to describe different types of EIs. Immediate Errata 1 SIP-005290 Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-005290.a Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-005290.b Specified [Required: AS-SIP EIs with P&P]. Changed “AS-SIP

EI” to AS-SIP EI with P&P. Immediate

Errata 1 SIP-005290.c Clarified to describe different types of EIs. Immediate Errata 1 SIP-005290.d Specified [Required: AS-SIP EIs with P&P]. Clarified to describe different types of EIs. Immediate

Errata 1 SIP-005300.a Clarified to describe different types of EIs. Immediate Errata 1 SIP-005310.a Clarified to describe different types of EIs. Immediate Errata 1 SIP-005320.a Clarified to describe different types of EIs. Immediate Errata 1 SIP-005330.a Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-005380.b Clarified to describe different types of EIs. Immediate Errata 1 SIP-005380.c Clarified to describe different types of EIs. Immediate Errata 1 SIP-005390.b Clarified to describe different types of EIs. Immediate Errata 1 SIP-005390.c Clarified to describe different types of EIs. Immediate Errata 1 SIP-005400.b Clarified to describe different types of EIs. Immediate Errata 1 SIP-005400.c Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-005400.d Clarified to describe different types of EIs. Immediate Errata 1 SIP-006360 Changed “AS-SIP EI” to AS-SIP EI with P&P. Immediate Errata 1 SIP-009900 Clarified to describe different types of EIs. Immediate Errata 1 SIP-010070.d Clarified to describe different types of EIs. Immediate Errata 1 SIP-010080 Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-010080.a Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-

010080.b.3 Specified [Required: AS-SIP EIs with P&P]. Immediate

Errata 1 SIP- 010080.b.3.b

Specified [Required: AS-SIP EIs with P&P]. Clarified to describe different types of EIs. Immediate

Errata 1 SIP-010090.d Clarified to describe different types of EIs. Immediate Errata 1 SIP-010100 Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-010100.a Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-010100.c Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-

010100.c.1 Specified [Required: AS-SIP EIs with P&P]. Clarified to describe different types of EIs. Immediate

Errata 1 SIP-010110.d Clarified to describe different types of EIs. Immediate Errata 1 SIP-010120 Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-010120.a Specified [Required: AS-SIP EIs with P&P]. Immediate iv

Errata 1 SIP-

010120.a.1 Specified [Required: AS-SIP EIs with P&P]. Immediate

Errata 1 SIP- 010120.a.2 Specified [Required: AS-SIP EIs with P&P]. Immediate

Errata 1 SIP-010120.c Specified [Required: AS-SIP EIs with P&P]. Immediate Errata 1 SIP-

010120.c.1 Specified [Required: AS-SIP EIs with P&P]. Immediate

Errata 1 SIP-010160.a Clarified to describe different types of EIs. Immediate Errata 1 SIP-010200.c Clarified to describe different types of EIs. Immediate Errata 1 SIP-010240.c Clarified to describe different types of EIs. Immediate Errata 1 SIP-010280.c Clarified to describe different types of EIs. Immediate

Change 1 SIP-000005 SCs support for interoperable AS-SIP line side interface and capability to serve AS-SIP EIs remains an optional requirement Immediate

Change 1 SIP-004940.b Corrected requirement numbers that were referenced Immediate Change 1 Section 9.7 Corrected section numbers referenced in this section Immediate Change 1 SIP-006610 Prepended [Optional]. Added G.723.1 Immediate Change 1 SIP-006620 Removed the separate video codec requirement for AS-SIP video conference EIs that establish peer to peer video sessions without a video conference system

Immediate

Change 1 SIP-006630 AS-SIP video conference EIs now only required to support H.264. No longer required to support H.263 or H.261 Immediate

Change 1 SIP-006635 Added requirement that lists the 3 optional video codecs for AS- SIP videoconference EIs: H.261, H.263, H.264 SVC Immediate

Change 1 SIP-006640 Removed G.722.1 from the list of required audio codecs for AS- SIP videoconference server Immediate

Change 1 SIP-006645 Added SIP-006645 which lists optional audio codecs for AS-SIP videoconference servers: G.722.1, G.723.1, G.728, G.729, G.729A

Immediate

Change 1 SIP-006650 changed minimum set of AS-SIP videoconference server video codecs to H.264. Removed H.263 and H.261 Immediate

Change 1 SIP-006655 Added SIP-006655 which lists H.261, H.263 and H.264 SVC as optional video codecs for AS-SIP videoconference servers Immediate

Change 1 Figure 16.2-1 The direction of the arrow for 12. ANM was incorrect and the diagram was replaced with one in which the arrow is pointing in the correct direction

Immediate

Change 1 Figure 16.2-4 Figure 16.2-4 was supposed to represent a TDM-to-IP call but actually depicted an IP-to-TDM call. Figure has been replaced with a correct TDM-to-IP call flow diagram

Immediate

Change 1 Sec 4.1.9

SIP-000572

SIP-000574

SIP-000576

New section. Added 4.1.9 Interoperability with Voice ISP: SIP- 000571, SIP-000572, SIP-000573. These new req’ts require the SC to be able to identify when an INVITE is intended for the voice ISP or was received via the voice ISP and requires early offer for INVITEs intended for the voice ISP and reiterates that calls exchanged with the Voice ISP must use the <+> <E.164> format.

18 months v

Change 1 SIP-004850 A note was added to clarify that the requirement does not apply for UPDATEs received prior to the establishment of an early dialog.

Immediate

Change 1 SIP-006192 New requirement applicable to call forward (call forward unconditional, call forward no answer, call forward busy). When call is forwarded SC must add History-Info header if not already present (and 2 events: 1st with value from received Request URI, 2nd with value from new Request-URI) or if History-Info header is present then when call is forwarded SC adds event with value from new Request-URI.

18 months

Change 1 SIP-006194 New requirement. If SS receives INVITE with History-Info header then SS must preserve History-Info header when forwarding INVITE; SS SHOULD add History-Info entry

18 months

Change 1 SIP-006196 New requirement. SC, SS must not add Privacy header with priv-value "history"; SC, SS must not add privacy header escaped in the hi-targeted-to-uri with a priv-value of "history"

18 months

Change 1 SIP-006342 New requirement. If transferee and/or transfer target in an unattended transfer is accessed via voice ISP then SC cannot use REFER method and must instead use INVITE and re-INVITE method

18 months

Change 1 SIP-006348 New requirement. If transferee and/or transfer target in an attended transfer is accessed via voice ISP then SC cannot use REFER method and must instead use INVITE and re-INVITE method. Also cannot use Replaces header

18 months

Change 1 SIP-006382 New requirement. If any of the EIs in a 3-way call are accessed via the voice ISP then the SC establishing the 3-way call cannot use the REFER method and must instead use the INVITE and re- INVITE method.

18 months

Table of Contents i

TABLE OF CONTENTS

SECTION PAGE

Section 1 Introduction .................................................................................................................. 1-1

1.1 Purpose ....................................................................................................................... 1-1

1.2 Scope .......................................................................................................................... 1-1

1.2.1 SBU and Classified Requirements .................................................................... 1-1

1.3 Applicability .............................................................................................................. 1-2

1.4 UCR 2013 Document suite ........................................................................................ 1-2

1.5 Applicable Standards ................................................................................................. 1-3

1.6 Specification Language and Syntax ........................................................................... 1-3

1.7 General Requirement Language ................................................................................ 1-3

1.7.1 Product Applicability ........................................................................................ 1-4

1.7.1.1 Minimum Requirements .......................................................................... 1-4

1.7.1.2 Optional Requirements ............................................................................ 1-4

1.8 Definitions.................................................................................................................. 1-4 Section 2 Signaling Design .......................................................................................................... 2-1 Section 3 Calling Path Reference Cases ...................................................................................... 3-1 Section 4 SIP Requirements for AS-SIP Signaling Appliances and AS-SIP EIs ........................ 4-1

4.1 Introduction ................................................................................................................ 4-1

4.1.1 SCs Serving AS-SIP EIs ................................................................................... 4-2

4.1.2 SCs Serving IP EIs Other Than AS-SIP EIs ..................................................... 4-3

4.1.3 Basic Requirements .......................................................................................... 4-4

4.1.4 Failure To Establish TLS Connection............................................................... 4-7

4.1.5 Vacant Code Treatment .................................................................................... 4-9

4.1.6 Early Media ..................................................................................................... 4-11

4.1.6.1 Early Media and Empty INVITE ........................................................... 4-15

4.1.6.2 Interworking Early Media to the TDM Network ................................... 4-16

4.1.7 Media Feature Tags ......................................................................................... 4-16

4.1.8 P-Asserted-Identity ......................................................................................... 4-16

4.1.9 Interoperability with Commercial PSTN Providers Through the DISA

Voice ISP Program ......................................................................................... 4-17

4.2 SIP Methods ............................................................................................................. 4-18

4.2.1 INVITE Request ............................................................................................. 4-18

4.2.2 CANCEL Request ........................................................................................... 4-18

4.2.3 REGISTER Request........................................................................................ 4-18

4.2.3.1 AS-SIP EI Creation of Register Request ............................................... 4-18 ii

4.2.3.2 Registrar Processing of Register Request .............................................. 4-20

4.2.4 OPTIONS Request .......................................................................................... 4-23

4.2.5 BYE Request ................................................................................................... 4-24

4.2.6 ACK Request .................................................................................................. 4-24

4.2.7 PRACK Request ............................................................................................. 4-24

4.2.8 UPDATE Request ........................................................................................... 4-24

4.2.9 REFER Request .............................................................................................. 4-24

4.2.10 SUBSCRIBE Request ..................................................................................... 4-24

4.2.11 NOTIFY Request ............................................................................................ 4-25

4.2.12 SIP INFO Method ........................................................................................... 4-25

4.3 SIP Header Fields .................................................................................................... 4-25

4.3.1 SC Header Requirements ................................................................................ 4-37

4.3.1.1 Referred-By Header ............................................................................... 4-38

4.3.1.2 Route Header – SC................................................................................. 4-38

4.3.1.3 Route Header – Softswitch .................................................................... 4-39

4.3.1.4 Route Header – SC (Classified Network Only) ..................................... 4-40

4.3.1.5 Route Header – Tier0 SS (Classified Network Only) ............................ 4-42

4.3.1.6 “CCA-ID” Parameter for Contact Header ............................................. 4-43

4.3.1.7 Via Header – Rules for SIP Proxy ......................................................... 4-45

4.3.1.8 Via Header – Rules for B2BUA ............................................................ 4-46

4.3.1.9 Via Header – Rules for SC Acting as UAC/UAS on Behalf of the IP

EI ............................................................................................................ 4-46

4.3.1.10 Via Header – Rules for AS-SIP EI ........................................................ 4-47

4.3.2 AS-SIP EI Header Requirements .................................................................... 4-47

4.3.2.1 Referred-By Header ............................................................................... 4-48

4.3.2.2 Tags ........................................................................................................ 4-48

4.4 SIP Response Codes ................................................................................................ 4-48

4.4.1 SCs Serving AS-SIP EIs ................................................................................. 4-48

4.4.2 AS-SIP EIs ...................................................................................................... 4-52

4.4.3 SCs Serving SIP EIs ....................................................................................... 4-53

4.4.4 SCs Serving H.323 and/or Proprietary IP EIs ................................................. 4-56

4.5 Precondition ............................................................................................................. 4-58

4.5.1 SBU Network .................................................................................................. 4-58

4.5.2 Classified Network .......................................................................................... 4-60

4.5.2.1 “Optional” Strength-Tag ........................................................................ 4-60

4.5.2.2 “Mandatory” Strength-Tag .................................................................... 4-61

4.6 SIP URI and Mapping of Telephone Number Into SIP URI ................................... 4-62

4.6.1 DSN Numbers ................................................................................................. 4-62 iii

4.6.2 N11 Service Codes .......................................................................................... 4-67

4.6.3 PSTN Numbers ............................................................................................... 4-68

4.6.4 Example Request-URI Fields ......................................................................... 4-72

4.7 64 Kbps Transparent Calls (Clear Channel) ............................................................ 4-73

4.8 Transport of Route Code Information Over AS-SIP ............................................... 4-74

4.9 Confidentiality Access Level General Requirements .............................................. 4-76

4.9.1 CAL Header .................................................................................................... 4-77

4.9.1.1 mode-param Field .................................................................................. 4-78

4.9.2 Presence of CAL Header in INVITE Requests, 200 Responses, 418 Responses ........................................................................................................ 4-78

4.9.3 AS-SIP EIs and SIP EIs Do NOT Generate CAL Header .............................. 4-79

4.9.4 Generating the CAL Header – SC .................................................................. 4-80

4.9.5 Confidential-Access-Level Option Tag .......................................................... 4-81

4.9.6 (Incompatible CAL) Response ....................................................................... 4-82

4.9.7 CAL Header Processing .................................................................................. 4-82

4.9.7.1 INVITE .................................................................................................. 4-82

4.9.7.2 Response ................................................................................................ 4-84

4.9.8 Example of CAL Header Traversing the Signaling Path ................................ 4-86

4.10 Session Keep-Alive Timer ....................................................................................... 4-88

4.10.1 AS-SIP Signaling Appliances ......................................................................... 4-88

4.10.2 AS-SIP EIs ...................................................................................................... 4-90

Section 5 Session Description Protocol ....................................................................................... 5-1

5.1 Session Description .................................................................................................... 5-1

5.2 Session-Level Description ......................................................................................... 5-2

5.2.1 Protocol Version (“v=”) Line............................................................................ 5-2

5.2.2 Origin (“o=”) Line ............................................................................................ 5-2

5.2.3 Session Name (“s=”) Line ................................................................................ 5-3

5.2.4 Time (“t=”) Line ............................................................................................... 5-4

5.2.5 Clarification on the Use of ANAT for Related Media Streams ........................ 5-4

5.3 Media Description ...................................................................................................... 5-6

5.3.1 Media (“m=”) Field .......................................................................................... 5-6

5.3.2 Connection Data (“c=”) Field ........................................................................... 5-7

5.3.3 Attributes (“a=”) Fields .................................................................................... 5-8

5.3.4 Bandwidth (“b=”) Field .................................................................................... 5-9

5.3.5 Bandwidth Modifier Application Rules .......................................................... 5-10

5.4 SDP Parameters for Video Codecs .......................................................................... 5-11

5.4.1 H.261 Codec Parameters ................................................................................. 5-11

5.4.2 H.263 Codec Parameters ................................................................................. 5-13 iv

5.4.2.1 H.263-1998 Optional Parameters ........................................................... 5-14

5.4.2.2 Support for Optional Annexes ............................................................... 5-16

5.4.2.3 Other Optional Parameters ..................................................................... 5-17

5.4.2.4 H.263-2000 Optional Parameters ........................................................... 5-18

5.4.2.5 H.263 SDP Offer Answer Rules ............................................................ 5-19

5.4.3 H.264 Codec Parameters ................................................................................. 5-20

5.4.3.1 SDP Offer/Answer Rules for H.264 Optional Parameters ..................... 5-25

5.4.3.2 Interaction of H.264 OPTIONAL Parameter Capability Exchange and Direction Attribute .......................................................................... 5-27

5.4.3.3 Miscellaneous H.264 Capability Exchange Rules ................................. 5-27

5.5 SDP Offer/Answer Exchange .................................................................................. 5-28

5.6 Additional Offer/Answer Rules for AS-SIP Video ................................................. 5-29

5.6.1 Generating the Initial Offer ............................................................................. 5-29

5.6.2 Generating the Answer ................................................................................... 5-29

5.6.3 Offeror Processing of the Answer ................................................................... 5-29

5.7 SDP Examples ......................................................................................................... 5-29

5.7.1 Basic SDP Exchange ....................................................................................... 5-29

Section 6 Precedence and Preemption ......................................................................................... 6-1

6.1 Precedence Level Communicated Over SIP Signaling .............................................. 6-1

6.1.1 Resource-Priority Header Field ........................................................................ 6-1

6.1.1.1 Namespace ............................................................................................... 6-2

6.1.1.2 Configuring the Set of Network-Domain Values To Be Received and Recognized by an AS-SIP Signaling Appliance or AS-SIP EI with P&P .................................................................................................. 6-2

6.1.1.3 Configuring the Network-Domain Value To Be Generated by an AS-SIP Signaling Appliance or AS-SIP EI with P&P ............................. 6-3

6.1.1.4 r-priority ................................................................................................... 6-5

6.1.1.5 Classified Only Requirement ................................................................... 6-6

6.1.2 Requirements for SCs Serving IP EIs ............................................................... 6-6

6.1.2.1 SIP Message Without Resource-Priority Header Received From

Served AS-SIP EI or SIP EI..................................................................... 6-6

6.1.2.2 SIP Message With Resource-Priority Header Received From Served

AS-SIP EI or SIP End Instrument ............................................................ 6-7

6.1.2.3 Call Request Received From Served H.323 or Proprietary IP EI .......... 6-11

6.1.2.4 AS-SIP Message With Resource-Priority Header for Served IP EI ...... 6-12

6.1.3 Option Tag “resource-priority” ....................................................................... 6-12

6.1.4 Error Conditions .............................................................................................. 6-13

6.1.4.1 SC Serving IP EI: Improper Network-Domain, Priority Value, or Precedence-Domain ............................................................................... 6-13 v

6.1.4.2 AS-SIP IP EI: Improper Network-Domain, Priority Value, or Precedence-Domain ............................................................................... 6-14

6.1.4.3 Originating SS: Improper Network-Domain, Priority Value, or Precedence-Domain ............................................................................... 6-15

6.1.4.4 Terminating SS: Improper Network-Domain, Priority Value, or Precedence-Domain ............................................................................... 6-17

6.1.4.5 Authentication Failure ........................................................................... 6-18

6.1.4.6 Authorization Failure ............................................................................. 6-19

6.1.4.7 Insufficient Resources ............................................................................ 6-21

6.1.4.8 Re-INVITE With Different Resource-Priority Header .......................... 6-24

6.2 Precedence Call Rules .............................................................................................. 6-25

6.2.1 AS Precedence Capability and Call Forwarding ............................................ 6-26

6.3 Call Origination Busy .............................................................................................. 6-28

6.4 ASAC Preemption Requirements ............................................................................ 6-30

6.4.1 Reason Header for Preemption ....................................................................... 6-30

6.4.2 Preemption at the IP EI ................................................................................... 6-32

6.4.2.1 General Preemption Rules for Behavior at IP EIs ................................. 6-32

6.4.2.2 Required Behavior at Called IP EI When Active Call Is Preempted by Higher Precedence Call Request ....................................................... 6-37

6.4.2.3 Implementing Preemption on Behalf of Called IP EIs .......................... 6-39

6.4.3 Network Preemption ....................................................................................... 6-48

6.4.3.1 Circumstances Under Which an SC Performs Network Preemption ..... 6-48

6.4.3.2 Implementing the Network Preemption ................................................. 6-51

6.5 ASAC Rule Set ........................................................................................................ 6-55

6.5.1 SC Component of SS ...................................................................................... 6-55

6.5.2 Empty INVITE ................................................................................................ 6-56

6.5.3 SC .................................................................................................................... 6-57

6.5.3.1 Outbound INVITE and re-INVITE ........................................................ 6-57

6.5.3.2 Inbound INVITE and re-INVITE .......................................................... 6-59

6.5.4 Softswitch ....................................................................................................... 6-61

6.5.4.1 Outbound INVITE and re-INVITE ........................................................ 6-62

6.5.4.2 Inbound INVITE and re-INVITE .......................................................... 6-64

Section 7 SS Policing of Call Count Thresholds ......................................................................... 7-1

7.1 Introduction ................................................................................................................ 7-1

7.2 Policing of Telephony Calls and Call Requests ......................................................... 7-1

7.2.1 Policing of Outbound Telephony Call Requests ............................................... 7-2

7.2.1.1 Outbound INVITE and re-INVITE .......................................................... 7-2

7.2.2 Policing of Inbound Telephony Call Requests ................................................. 7-4

7.2.2.1 Inbound INVITE With sdp ...................................................................... 7-4 vi

7.2.2.2 Inbound Empty INVITE .......................................................................... 7-6

7.2.2.3 Inbound re-INVITE ............................................................................... 7-11

7.2.3 Notification to the NMS .................................................................................. 7-13

7.2.4 Operational Adjustments ................................................................................ 7-14

7.3 Policing of Video Sessions and Session Requests ................................................... 7-14

7.3.1 Policing of Outbound Video Session Requests .............................................. 7-15

7.3.2 Policing of Inbound Video Session Requests ................................................. 7-18

7.3.2.1 Inbound INVITE .................................................................................... 7-18

7.3.2.2 Inbound re-INVITE ............................................................................... 7-21

7.3.3 Notification to the NMS .................................................................................. 7-25

7.3.4 Operational Adjustments ................................................................................ 7-26

Section 8 Video Telephony – General Rules ............................................................................... 8-1

8.1 Caller .......................................................................................................................... 8-1

8.2 Callee ......................................................................................................................... 8-2

8.3 IP-to-IP Video Telephony Call Flows ....................................................................... 8-3

8.3.1 INVITE With sdp Video Offer Accepted in 200 Response With sdp Answer .............................................................................................................. 8-5

8.3.1.1 INVITE With sdp Video Offer Accepted in 200 Response With sdp Answer (AS-SIP EI) ................................................................................ 8-7

8.3.2 INVITE With sdp Video Offer – Called Party Accepts Video After 200 Response ........................................................................................................... 8-8

8.3.2.1 INVITE With sdp Video Offer – Called Party Accepts Video After 200 Response (AS-SIP EI) ..................................................................... 8-12

8.3.3 Empty INVITE – Caller Requests Video; Called Party Offers Video (Media Feature Tags NOT Used) ................................................................... 8-13

8.3.3.1 Empty INVITE – Caller Requests Video; Called Party Offers Video (Media Feature Tags NOT Used) – AS-SIP EI Receives Empty INVITE .................................................................................................. 8-16

8.3.4 Empty INVITE – Caller Requests Video; Called Party Offers Audio;

Caller Again Requests Video (Media Feature Tags NOT Used) .................... 8-17

8.3.4.1 Empty INVITE – Caller Requests Video; Called Party Offers Audio;

Caller Again Requests Video (Media Feature Tags NOT Used) (AS- SIP EI Receives Empty INVITE) .......................................................... 8-20

8.3.5 Empty INVITE – Caller Requests Video; Called party Offers Video (Media Feature Tags Used by Originating SC and Terminating SC) ............. 8-21

8.3.5.1 Empty INVITE – Caller Requests Video; Called Party Offers Video (Media Feature Tags Used by Originating SC and Terminating SC)

– AS-SIP EI Receives Empty INVITE .................................................. 8-24

8.3.6 Empty INVITE – Caller Requests Video; Called Party Offers Audio – Calling Party Again Requests Video (Media Feature Tags Used by Originating SC and Terminating SC) ............................................................. 8-25 vii

8.4 Point-to-Point Video Conference Unit Call Flows .................................................. 8-29

8.4.1 VCU INVITE With sdp Video Offer .............................................................. 8-29

8.4.1.1 VCU INVITE With sdp Video Offer (AS-SIP VCU EI) ....................... 8-30

8.4.2 VCU Empty INVITE (Media Feature Tags NOT Used) ................................ 8-31

8.4.2.1 VCU Empty INVITE (Media Feature Tags NOT Used) – AS-SIP VCU EIs ................................................................................................. 8-33

8.4.3 VCU Empty INVITE (Media Feature Tags Used by Originating SC and Terminating SC).............................................................................................. 8-34

8.4.3.1 VCU Empty INVITE (Media Feature Tags Used) – AS-SIP VCU EIs .......................................................................................................... 8-36

Section 9 Calling Services ........................................................................................................... 9-1

9.1 Introduction ................................................................................................................ 9-1

9.2 Point-to-Point Call ..................................................................................................... 9-1

9.2.1 IP-to-IP Call Type ............................................................................................. 9-1

9.2.1.1 Successful Basic IP-to-IP Call (No Reliable Provisional Responses, No Preconditions) .................................................................................... 9-1

9.2.1.2 Successful Basic IP to IP Call (End-to-End Precondition) ...................... 9-4

9.2.1.3 Successful Basic IP to IP Call (Segmented Precondition) ....................... 9-6

9.3 Call Hold .................................................................................................................... 9-8

9.3.1 IP-to-IP Call Type ............................................................................................. 9-8

9.3.1.1 Successful Basic IP-to-IP Call Hold (AS-SIP EI) ................................. 9-13

9.3.2 [Conditional] Music on Hold .......................................................................... 9-14

9.3.2.1 IP-to-IP Call Type .................................................................................. 9-14

9.4 Call Waiting ............................................................................................................. 9-25

9.4.1 IP-to-IP Call Type ........................................................................................... 9-25

9.4.1.1 Successful Basic IP-to-IP Call Waiting (AS-SIP EI) ............................ 9-28

9.5 Call Forward ............................................................................................................ 9-30

9.5.1 Call Forward (Unconditional) ......................................................................... 9-30

9.5.1.1 IP-to-IP Call Type .................................................................................. 9-31

9.5.2 Call Forward (No Answer) ............................................................................. 9-37

9.5.2.1 IP-to-IP Call Type .................................................................................. 9-37

9.5.3 Call Forward (Busy) ....................................................................................... 9-44

9.5.3.1 IP-to-IP Call Type .................................................................................. 9-44

9.6 Call Transfer ............................................................................................................ 9-51

9.6.1 Call Transfer Modes ....................................................................................... 9-51

9.6.2 Unattended Transfer – Call Transferor: SIP ................................................... 9-51

9.6.2.1 Unattended Call Transfer for IP EIs (REFER Method) ......................... 9-52

9.6.2.2 Unattended Call Transfer for IP EIs (INVITE and re-INVITE

Method) .................................................................................................. 9-57 viii

9.6.3 Attended Transfer – Call Transferor: SIP ....................................................... 9-60

9.6.3.1 Attended Call Transfer for IP EIs (REFER Method) ............................. 9-60

9.6.3.2 Attended Call Transfer for IP EI (INVITE and re-INVITE Method) .... 9-69

9.7 Three-Way Audio Call ............................................................................................. 9-72

9.7.1 Three-Way Audio Call Performed by EI ........................................................ 9-73

9.7.1.1 Precedence and Preemption Rule for Three-Way Audio Calls at EI ..... 9-73

9.7.1.2 Proprietary IP EI (i.e., non-AS-SIP EI) Provides Focus for Three-

Way Audio Call ..................................................................................... 9-75

9.7.1.3 AS-SIP EI Provides Focus for Three-Way Audio Call ......................... 9-77

9.7.2 Three-Way Audio Call Performed by SC on Behalf of Served Proprietary EI w/i SC SUT ................................................................................................ 9-79

9.7.2.1 Precedence and Preemption Rule for Three-Way Audio Calls at SC .... 9-80

9.7.2.2 Refer Method for Three-Way Call at SC ............................................... 9-80

9.7.2.3 Re-INVITE Method for Three-Way Call at SC ..................................... 9-83

Section 10 Audio and Video Conference Services .................................................................... 10-1

10.1 Audio Conference Servers and Video Conference Servers ..................................... 10-1

10.1.1 SC (or SS)-Conference Server Configurations ............................................... 10-1

10.1.2 Precedence and Preemption Rules for Audio and Video Conference

Servers............................................................................................................. 10-2

10.1.3 Definitions of Terms ....................................................................................... 10-2

10.1.4 EI Requirements Related to Audio Conferencing .......................................... 10-3

10.2 Audio Conferencing ................................................................................................. 10-3

10.2.1 Ad Hoc Audio Conference.............................................................................. 10-3

10.2.1.1 Call Flow Diagrams ............................................................................... 10-5

10.2.2 Reservationless Audio Conference ............................................................... 10-19

10.2.2.1 Call Flow Diagrams ............................................................................. 10-22

10.2.3 Scheduled Audio Conference ....................................................................... 10-34

10.2.3.1 Call Flow Diagrams ............................................................................. 10-35

10.3 Videoconference Requirements ............................................................................. 10-45

10.3.1 Videoconference EIs ..................................................................................... 10-45

10.3.2 Audio and Video Codecs .............................................................................. 10-47

10.3.3 Role-Based Video Stream (RBVS) ............................................................... 10-48

10.3.3.1 Assignment of Roles to Media Streams ............................................... 10-49

10.3.3.2 Negotiating RBVS Capabilities Between AS-SIP Videoconference

EIs (RBVS-Compliant SIP Videoconference EIs) and AS-SIP Videoconference Servers ..................................................................... 10-50

10.3.3.3 Managing Control of “slides” Video Stream Using BFCP .................. 10-61

10.3.4 Video Channel Flow Control ........................................................................ 10-68

10.3.5 Video Channel Fast Update Requests ........................................................... 10-71 ix

10.3.6 Far End Camera Control (FECC) ................................................................. 10-73

10.3.6.1 General H.224 Control Channel for Far-End Camera Control

Messages .............................................................................................. 10-74

10.3.6.2 Far End Camera Control – ITU-T H.281 ............................................. 10-75

10.3.7 Scheduled Videoconference .......................................................................... 10-77

10.3.7.1 ASAC ................................................................................................... 10-79

10.3.7.2 Call Flow Diagrams ............................................................................. 10-79

Section 11 Modem on IP Networks ........................................................................................... 11-1

11.1 AS-SIP Signaling Requirements in Support of Modem Relay-Capable

Gateways .................................................................................................................. 11-1

11.1.1 Advertisement of Modem Relay Capabilities in SDP Offer on Behalf of

Modem Relay Capable Gateways ................................................................... 11-1

11.1.2 Advertisement of Modem Relay Capabilities in SDP Answer on Behalf of

Modem Relay Capable Gateways ................................................................... 11-7

11.2 AS-SIP Signaling Requirements in Support of UC SCIP EIs ............................... 11-13

11.2.1 UC SCIP EI Advertisement of Modem Relay Capabilities in SDP Offer .... 11-13

11.2.2 UC SCIP EI Advertisement of Modem Relay Capabilities in SDP Answer 11-18

Section 12 TDM – SIP Translation Requirements for Inter-Working AS-SIP Signaling Appliances ........................................................................................................... 12-1

12.1 Introduction .............................................................................................................. 12-1

12.1.1 TDM-to-TDM Calls Over IP Backbone ......................................................... 12-1

12.1.2 TDM-to-IP Calls Over an IP Backbone .......................................................... 12-5

12.1.3 5.3.4.14.1.3 IP-to-TDM Calls Over an IP Backbone ...................................... 12-8

12.2 Summary Description of the Three Call Types ..................................................... 12-10

12.2.1 TDM Bridging .............................................................................................. 12-10

12.2.2 TDM-to-IP Call ............................................................................................. 12-10

12.2.3 IP-to-TDM Call ............................................................................................. 12-11

12.3 SIP URI and Mapping of Telephony Number Into SIP URI ................................. 12-11

12.4 General Requirements for Interworking AS-SIP Signaling Appliances ................ 12-12

12.5 ISUP Versions ........................................................................................................ 12-13

12.5.1 Encapsulation of ISUP Messages in AS-SIP Requests/Responses ............... 12-13

12.5.2 De-Encapsulation of ISUP Messages From AS-SIP Requests/Responses ... 12-13

12.5.3 ISUP Messages That Are Never Encapsulated ............................................. 12-13

12.5.4 Tones ............................................................