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    ITU-T A.5 justification information for referenced document ETSI TS 124 229 V10.21.0 (2016-01) in draft Q.3640
    1. Clear description of the referenced document:
    Title: IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3
    2. Status of approval:
    published
    3. Justification for the specific reference:
    It is used as a reference in the Recommendation ITU-T Q.30xx_VoLTE_Interconnection_FW
    4. Current information, if any, about IPR issues:
    Information about IPR could be available for ETSI members and non-members and found in SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards", which is available free of charge from the ETSI Secretariat and on the ETSI web site http://www.etsi.org/ipr.
    5. Other useful information describing the "Quality" of the document:
    Normative
    6. The degree of stability or maturity of the document:
    Stable
    7. Relationship with other existing or emerging documents:
    References within the referenced standards are listed under item (8).
    8. Any explicit references within that referenced document should also be listed:
    [1] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications"./
    [1A] 3GPP TS 22.101: "Service aspects; Service principles"./
    [1B] 3GPP TS 22.003: "Circuit Teleservices supported by a Public Land Mobile Network (PLMN)"./
    [2] 3GPP TS 23.002: "Network architecture"./
    [3] 3GPP TS 23.003: "Numbering, addressing and identification"./
    [4] 3GPP TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2"./
    [4A] 3GPP TS 23.107: "Quality of Service (QoS) concept and architecture"./
    [4B] 3GPP TS 23.167: "IP Multimedia Subsystem (IMS) emergency sessions"./
    [4C] 3GPP TS 23.122: "Non-Access-Stratum (NAS) functions related to Mobile Station (MS) in idle mode"./
    [4D] 3GPP TS 23.140 Release 6: "Multimedia Messaging Service (MMS); Functional description; Stage 2"./
    [5] 3GPP TS 23.218: "IP Multimedia (IM) Session Handling; IM call model"./
    [6] 3GPP TS 23.221: "Architectural requirements"./
    [7] 3GPP TS 23.228: "IP multimedia subsystem; Stage 2"./
    [7A] 3GPP TS 23.234: "3GPP system to Wireless Local Area Network (WLAN) interworking; System description"./
    [7B] 3GPP TS 23.401: "GPRS enhancements for E-UTRAN access"./
    [7C] 3GPP TS 23.292: "IP Multimedia Subsystem (IMS) Centralized Services; Stage 2"./
    [7D] 3GPP TS 23.380: "IMS Restoration Procedures"./
    [7E] 3GPP TS 23.402: "Architecture enhancements for non-3GPP accesses"./
    [7F] 3GPP TS 23.334: "IMS Application Level Gateway (IMS-ALG) – IMS Access Gateway (IMS-AGW) interface"./
    [8] 3GPP TS 24.008: "Mobile radio interface layer 3 specification; Core Network protocols; Stage 3"./
    [8A] 3GPP TS 24.141: "Presence service using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3"./
    [8B] 3GPP TS 24.147: "Conferencing using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3"./
    [8C] 3GPP TS 24.234: "3GPP System to Wireless Local Area Network (WLAN) interworking; User Equipment (UE) to network protocols; Stage 3"./
    [8D] Void./
    [8E] 3GPP TS 24.279: "Combining Circuit Switched (CS) and IP Multimedia Subsystem (IMS) services, stage 3, Release 7"./
    [8F] 3GPP TS 24.247: "Messaging service using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3"./
    [8G] 3GPP TS 24.167: "3GPP IMS Management Object (MO); Stage 3"./
    [8H] 3GPP TS 24.173: "IMS Multimedia telephony service and supplementary services; Stage 3"./
    [8I] 3GPP TS 24.606: "Message Waiting Indication (MWI) using IP Multimedia (IM) Core Network (CN) subsystem; Protocol specification"./
    [8J] 3GPP TS 24.301: "Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3"./
    [8K] Void. /
    [8L] 3GPP TS 24.341: "Support of SMS over IP networks; Stage 3"./
    [8M] 3GPP TS 24.237: "IP Multimedia Subsystem (IMS) Service Continuity; Stage 3"./
    [8N] 3GPP TS 24.647: "Advice Of Charge (AOC) using IP Multimedia (IM) Core Network (CN) subsystem"./
    [8O] 3GPP TS 24.292: "IP Multimedia (IM) Core Network (CN) subsystem Centralized Services (ICS); Stage 3"./
    [8P] 3GPP TS 24.623: "Extensible Markup Language (XML) Configuration Access Protocol (XCAP) over the Ut interface for Manipulating Supplementary Services"./
    [8Q] 3GPP TS 24.182: "IP Multimedia Subsystem (IMS) Customized Alerting Tones (CAT); Protocol specification"./
    [8R] 3GPP TS 24.183: "IP Multimedia Subsystem (IMS) Customized Ringing Signal (CRS); Protocol specification"./
    [8S] 3GPP TS 24.616: "Malicious Communication Identification (MCID) using IP Multimedia (IM) Core Network (CN) subsystem"./
    [8T] 3GPP TS 24.305: "Selective Disabling of 3GPP User Equipment Capabilities (SDoUE) Management Object (MO)"./
    [9] 3GPP TS 25.304: "UE Procedures in Idle Mode and Procedures for Cell Reselection in Connected Mode"./
    [9A] 3GPP TS 25.331: "Radio Resource Control (RRC); Protocol Specification"./
    [10] Void./
    [10A] 3GPP TS 27.060: "Mobile Station (MS) supporting Packet Switched Services"./
    [11] 3GPP TS 29.061: "Interworking between the Public Land Mobile Network (PLMN) supporting Packet Based Services and Packet Data Networks (PDN)"./
    [11A] 3GPP TS 29.162: "Interworking between the IM CN subsystem and IP networks"./
    [11B] 3GPP TS 29.163: "Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks"./
    [11C] 3GPP TS 29.161: "Interworking between the Public Land Mobile Network (PLMN) supporting Packet Based Services with Wireless Local Access and Packet Data Networks (PDN)"/
    [11D] 3GPP TS 29.079: "Optimal Media Routeing within the IP Multimedia Subsystem"./
    [12] 3GPP TS 29.207 Release 6: "Policy control over Go interface"./
    [13] Void./
    [13A] 3GPP TS 29.209 Release 6: "Policy control over Gq interface"./
    [13B] 3GPP TS 29.212: "Policy and Charging Control over Gx reference point"./
    [13C] 3GPP TS 29.213: "Policy and charging control signalling flows and Quality of Service (QoS) parameter mapping"./
    [13D] 3GPP TS 29.214: "Policy and Charging Control over Rx reference point"./
    [14] 3GPP TS 29.228: "IP Multimedia (IM) Subsystem Cx and Dx Interfaces; Signalling flows and message contents"./
    [15] 3GPP TS 29.229: "Cx and Dx Interfaces based on the Diameter protocol, Protocol details"./
    [15A] 3GPP TS 29.311: "Service Level Interworking for Messaging Services"./
    [15B] 3GPP TS 31.103: "Characteristics of the IP multimedia services identity module (ISIM) application"./
    [15C] 3GPP TS 31.102: "Characteristics of the Universal Subscriber Identity Module (USIM) application"./
    [15D] 3GPP TS 31.111: "Universal Subscriber Identity Module (USIM) Application Toolkit (USAT)"./
    [16] 3GPP TS 32.240: "Telecommunication management; Charging management; Charging architecture and principles"./
    [17] 3GPP TS 32.260: "Telecommunication management; Charging management; IP Multimedia Subsystem (IMS) charging"./
    [17A] Void./
    [18] 3GPP TS 33.102: "3G Security; Security architecture"./
    [19] 3GPP TS 33.203: "Access security for IP based services"./
    [19A] 3GPP TS 33.210: "3G Security; Network Domain Security; IP Network Layer Security"./
    [19B] 3GPP TS 36.304: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) procedures in idle mode"./
    [19C] 3GPP TS 33.328: "IP Multimedia Subsystem (IMS) media plane security"./
    [20] 3GPP TS 44.018: "Mobile radio interface layer 3 specification, Radio Resource Control Protocol"./
    [20A] RFC 2401 (November 1998): "Security Architecture for the Internet Protocol"./
    [20B] RFC 1594 (March 1994): "FYI on Questions and Answers to Commonly asked "New Internet User" Questions"./
    [20C] Void./
    [20D] Void./
    [20E] RFC 2462 (November 1998): "IPv6 Address Autoconfiguration"./
    [20F] RFC 2132 (March 1997): "DHCP Options and BOOTP Vendor Extensions"./
    [20G] RFC 2234 (November 1997): "Augmented BNF for Syntax Specification: ABNF"./
    [21] RFC 2617 (June 1999): "HTTP Authentication: Basic and Digest Access Authentication"./
    [22] RFC 3966 (December 2004): "The tel URI for Telephone Numbers"./
    [23] RFC 4733 (December 2006): "RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals"./
    [24] RFC 3761 (April 2004): "The E.164 to Uniform Resource Identifiers (URI) Dynamic Delegation Discovery System (DDDS) Application (ENUM)"./
    [25] RFC 6086 (October 2009): "Session Initiation Protocol (SIP) INFO Method and Package Framework"./
    [25A] RFC 3041 (January 2001): "Privacy Extensions for Stateless Address Autoconfiguration in IPv6"./
    [26] RFC 3261 (June 2002): "SIP: Session Initiation Protocol"./
    [27] RFC 3262 (June 2002): "Reliability of provisional responses in Session Initiation Protocol (SIP)"./
    [27A] RFC 3263 (June 2002): "Session Initiation Protocol (SIP): Locating SIP Servers"./
    [27B] RFC 3264 (June 2002): "An Offer/Answer Model with Session Description Protocol (SDP)"./
    [28] RFC 3265 (June 2002): "Session Initiation Protocol (SIP) Specific Event Notification"./
    [28A] Void./
    [29] RFC 3311 (September 2002): "The Session Initiation Protocol (SIP) UPDATE method"./
    [30] RFC 3312 (October 2002): "Integration of resource management and Session Initiation Protocol (SIP)"./
    [31] RFC 3313 (January 2003): "Private Session Initiation Protocol (SIP) Extensions for Media Authorization"./
    [32] RFC 3320 (March 2002): "Signaling Compression (SigComp)"./
    [33] RFC 3323 (November 2002): "A Privacy Mechanism for the Session Initiation Protocol (SIP)"./
    [34] RFC 3325 (November 2002): "Private Extensions to the Session Initiation Protocol (SIP) for Network Asserted Identity within Trusted Networks"./
    [34A] RFC 3326 (December 2002): "The Reason Header Field for the Session Initiation Protocol (SIP)"./
    [35] RFC 3327 (December 2002): "Session Initiation Protocol Extension Header Field for Registering Non-Adjacent Contacts"./
    [35A] RFC 3361 (August 2002): "Dynamic Host Configuration Protocol (DHCP-for-IPv4) Option for Session Initiation Protocol (SIP) Servers"./
    [36] RFC 3515 (April 2003): "The Session Initiation Protocol (SIP) REFER method"./
    [37] RFC 3420 (November 2002): "Internet Media Type message/sipfrag"./
    [37A] RFC 3605 (October 2003): "Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP)"./
    [38] RFC 3608 (October 2003): "Session Initiation Protocol (SIP) Extension Header Field for Service Route Discovery During Registration"./
    [39] RFC 4566 (June 2006): "SDP: Session Description Protocol"./
    [40] RFC 3315 (July 2003): "Dynamic Host Configuration Protocol for IPv6 (DHCPv6)"./
    [40A] RFC 2131 (March 1997): "Dynamic host configuration protocol"./
    [41] RFC 3319 (July 2003): "Dynamic Host Configuration Protocol (DHCPv6) Options for Session Initiation Protocol (SIP) Servers"./
    [42] RFC 3485 (February 2003): "The Session Initiation Protocol (SIP) and Session Description Protocol (SDP) static dictionary for Signaling Compression (SigComp)"./
    [43] RFC 3680 (March 2004): "A Session Initiation Protocol (SIP) Event Package for Registrations"./
    [44] Void./
    [45] Void./
    [46] Void./
    [47] Void./
    [48] RFC 3329 (January 2003): "Security Mechanism Agreement for the Session Initiation Protocol (SIP)"./
    [49] RFC 3310 (September 2002): "Hypertext Transfer Protocol (HTTP) Digest Authentication Using Authentication and Key Agreement (AKA)"./
    [50] RFC 3428 (December 2002): "Session Initiation Protocol (SIP) Extension for Instant Messaging"./
    [51] Void./
    [52] RFC 3455 (January 2003): "Private Header (P-Header) Extensions to the Session Initiation Protocol (SIP) for the 3rd-Generation Partnership Project (3GPP)"./
    [53] RFC 3388 (December 2002): "Grouping of Media Lines in Session Description Protocol"./
    [54] RFC 3524 (April 2003): "Mapping of Media Streams to Resource Reservation Flows"./
    [55] RFC 3486 (February 2003): "Compressing the Session Initiation Protocol (SIP)"./
    [55A] RFC 3551 (July 2003): "RTP Profile for Audio and Video Conferences with Minimal Control"./
    [56] RFC 3556 (July 2003): "Session Description Protocol (SDP) Bandwidth Modifiers for RTP Control Protocol (RTCP) Bandwidth"./
    [56A] RFC 3581 (August 2003): "An Extension to the Session Initiation Protocol (SIP) for Symmetric Response Routing"./
    [56B] RFC 3841 (August 2004): "Caller Preferences for the Session Initiation Protocol (SIP)"./
    [56C] RFC 3646 (December 2003): "DNS Configuration options for Dynamic Host Configuration Protocol for IPv6 (DHCPv6)"./
    [57] ITU-T Recommendation E.164: "The international public telecommunication numbering plan"./
    [58] RFC 4028 (April 2005): "Session Timers in the Session Initiation Protocol (SIP)"./
    [59] RFC 3892 (September 2004): "The Session Initiation Protocol (SIP) Referred-By Mechanism"./
    [60] RFC 3891 (September 2004): "The Session Inititation Protocol (SIP) "Replaces" Header"./
    [61] RFC 3911 (October 2004): "The Session Inititation Protocol (SIP) "Join" Header"./
    [62] RFC 3840 (August 2004): "Indicating User Agent Capabilities in the Session Initiation Protocol (SIP)"./
    [63] RFC 3861 (August 2004): "Address Resolution for Instant Messaging and Presence"./
    [63A] RFC 3948 (January 2005): "UDP Encapsulation of IPsec ESP Packets"./
    [64] RFC 4032 (March 2005): "Update to the Session Initiation Protocol (SIP) Preconditions Framework"./
    [65] RFC 3842 (August 2004) "A Message Summary and Message Waiting Indication Event Package for the Session Initiation Protocol (SIP)"/
    [65A] RFC 4077 (May 2005): "A Negative Acknowledgement Mechanism for Signaling Compression"./
    [66] RFC 4244 (November 2005): "An Extension to the Session Initiation Protocol (SIP) for Request History Information"./
    [67] RFC 5079 (December 2007): "Rejecting Anonymous Requests in the Session Initiation Protocol (SIP)"./
    [68] RFC 4458 (January 2006): "Session Initiation Protocol (SIP) URIs for Applications such as Voicemail and Interactive Voice Response (IVR)"./
    [69] RFC 5031 (January 2008): "A Uniform Resource Name (URN) for Services"./
    [70] RFC 3903 (October 2004): "An Event State Publication Extension to the Session Initiation Protocol (SIP)"./
    [71] Void. /
    [72] RFC 3857 (August 2004): "A Watcher Information Event Template Package for the Session Initiation Protocol (SIP)"./
    [74] RFC 3856 (August 2004): "A Presence Event Package for the Session Initiation Protocol (SIP)"./
    [74A] RFC 3603 (October 2003): "Private Session Initiation Protocol (SIP) Proxy-to-Proxy Extensions for Supporting the PacketCable Distributed Call Signaling Architecture"./
    [74B] RFC 3959 (December 2004): "The Early Session Disposition Type for the Session Initiation Protocol (SIP)"./
    [75] RFC 4662 (August 2006): "A Session Initiation Protocol (SIP) Event Notification Extension for Resource Lists"./
    [77] RFC 5875 (May 2010): "An Extensible Markup Language (XML) Configuration Access Protocol (XCAP) Diff Event Package"./
    [78] RFC 4575 (August 2006): "A Session Initiation Protocol (SIP) Event Package for Conference State"./
    [79] RFC 5049 (December 2007): "Applying Signaling Compression (SigComp) to the Session Initiation Protocol (SIP)"./
    [80] RFC 3825 (July 2004): "Dynamic Host Configuration Protocol Option for Coordinate-based Location Configuration Information"./
    [81] Void./
    [82] RFC 4457 (April 2006): "The Session Initiation Protocol (SIP) P-User-Database Private-Header (P-header)"./
    [83] RFC 4145 (September 2005): "TCP-Based Media Transport in the Session Description Protocol (SDP)"./
    [84] RFC 4320 (January 2006): "Actions Addressing Identified Issues with the Session Initiation Protocol's (SIP) Non-INVITE Transaction"./
    [85] 3GPP2 C.S0005-D (March 2004): "Upper Layer (Layer 3) Signaling Standard for cdma2000 Standards for Spread Spectrum Systems"./
    [86] 3GPP2 C.S0024-A v1.0 (April 2004): "cdma2000 High Rate Packet Data Air Interface Standard"./
    [86A] 3GPP2 C.S0084-000 (April 2007): "Overview for Ultra Mobile Broadband (UMB) Air Interface Specification"./
    [86B] 3GPP2 X.S0060-0 v1.0: "HRPD Support for Emergency Services"./
    [86C] 3GPP2 X.S0057-B v1.0: "E-UTRAN - eHRPD Connectivity and Interworking: Core Network Aspects"./
    [86D] 3GPP2 C.S0014-C v1.0: "Enhanced Variable Rate Codec, Speech Service Options 3, 68, and 70 for Wideband Spread Spectrum Digital Systems"./
    [86E] 3GPP2 S.P0059-200-A v1.0: "cdma2000 Femtocell Network: 1x and IMS Network Aspects"./
    [86F] 3GPP2 S.R0048-A v4.0: "3G Mobile Equipment Identifier (MEID) - Stage 1"./
    [87] ITU-T Recommendation J.112, "Transmission Systems for Interactive Cable Television Services"/
    [88] PacketCable Release 2 Technical Report, PacketCableTM Architecture Framework Technical Report, PKT-TR-ARCH-FRM./
    [89] RFC 6442 (December 2011): "Location Conveyance for the Session Initiation Protocol"./
    [90] RFC 4119 (December 2005) "A Presence-based GEOPRIV Location Object Format"./
    [91] RFC 5012 (January 2008): "Requirements for Emergency Context Resolution with Internet Technologies"./
    [91A] Void./
    [92] RFC 5626 (October 2009): "Managing Client Initiated Connections in the Session Initiation Protocol (SIP)"./
    [93] RFC 5627 (October 2009): "Obtaining and Using Globally Routable User Agent URIs (GRUUs) in the Session Initiation Protocol (SIP)"./
    [94] RFC 5628 (October 2009): "Registration Event Package Extension for Session Initiation Protocol (SIP) Globally Routable User Agent URIs (GRUUs)"./
    [95] Void./
    [96] RFC 4168 (October 2005): "The Stream Control Transmission Protocol (SCTP) as a Transport for the Session Initiation Protocol (SIP)"./
    [97] RFC 5002 (August 2007): "The Session Initiation Protocol (SIP) P-Profile-Key Private Header (P-Header)"./
    [98] ETSI ES 283 035: "Telecommunications and Internet Converged Services and Protocols for Advanced Networks (TISPAN); Network Attachment Sub-System (NASS); e2 interface based on the DIAMETER protocol"./
    [99] RFC 5245 (April 2010): "Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal for Offer/Answer Protocols"./
    [100] RFC 5389 (October 2008): "Session Traversal Utilities for NAT (STUN)"./
    [101] RFC 5766 (April 2010): "Traversal Using Relays around NAT (TURN): Relay Extensions to Session Traversal Utilities for NAT (STUN)"./
    [102] RFC 5768 (April 2010): "Indicating Support for Interactive Connectivity Establishment (ICE) in the Session Initiation Protocol (SIP)"./
    [103] RFC 4967 (July 2007): "Dial String Parameter for the Session Initiation Protocol Uniform Resource Identifier"./
    [104] RFC 5365 (October 2008): "Multiple-Recipient MESSAGE Requests in the Session Initiation Protocol (SIP)"./
    [105] RFC 5368 (October 2008): "Referring to Multiple Resources in the Session Initiation Protocol (SIP)"./
    [106] RFC 5366 (October 2008): "Conference Establishment Using Request-Contained Lists in the Session Initiation Protocol (SIP)"./
    [107] RFC 5367 (October 2008): "Subscriptions to Request-Contained Resource Lists in the Session Initiation Protocol (SIP)"./
    [108] RFC 4583 (November 2006): "Session Description Protocol (SDP) Format for Binary Floor Control Protocol (BFCP) Streams"./
    [109] RFC 5009 (September 2007): "Private Header (P-Header) Extension to the Session Initiation Protocol (SIP) for Authorization of Early Media"./
    [110] RFC 4354 (January 2006): "A Session Initiation Protocol (SIP) Event Package and Data Format for Various Settings in Support for the Push-to-Talk over Cellular (PoC) Service"./
    [111] RFC 4964 (September 2007): "The P-Answer-State Header Extension to the Session Initiation Protocol for the Open Mobile Alliance Push to Talk over Cellular"./
    [112] RFC 4694 (October 2006): "Number Portability Parameters for the 'tel' URI"./
    [113] Void./
    [114] RFC 4769 (November 2006): "IANA Registration for an Enumservice Containing Public Switched Telephone Network (PSTN) Signaling Information"./
    [115] RFC 4411 (February 2006): "Extending the Session Initiation Protocol (SIP) Reason Header for Preemption Events"./
    [116] RFC 4412 (February 2006): "Communications Resource Priority for the Session Initiation Protocol (SIP)"./
    [117] RFC 5393 (December 2008): "Addressing an Amplification Vulnerability in Session Initiation Protocol (SIP) Forking Proxies"./
    [118] RFC 4896 (June 2007): "Signaling Compression (SigComp) Corrections and ClarificationsImplementer's Guide for SigComp"./
    [119] RFC 5112 (January 2008): "The Presence-Specific Static Dictionary for Signaling Compression (Sigcomp)"./
    [120] RFC 5688 (January 2010): "A Session Initiation Protocol (SIP) Media Feature Tag for MIME Application Subtype"./
    [121] RFC 6050 (November 2010): "A Session Initiation Protocol (SIP) Extension for the Identification of Services"./
    [122] RFC 4346 (April 2006): "The TLS Protocol Version 1.1"./
    [123] Void./
    [124] RFC 3986 (January 2005): "Uniform Resource Identifiers (URI): Generic Syntax"./
    [125] RFC 5360 (October 2008): "A Framework for Consent-Based Communications in the Session Initiation Protocol (SIP)"./
    [126] RFC 7433 (January 2015): "A Mechanism for Transporting User-to-User Call Control Information in SIP"./
    [126A] RFC 7434 (January 2015): "Interworking ISDN Call Control User Information with SIP"./
    [127] 3GPP2 X.S0011-C: "cdma2000 Wireless IP Network Standard "./
    [130] RFC 6432 (November 2011): "Carrying Q.850 Codes in Reason Header Fields in SIP (Session Initiation Protocol) Responses"./
    [131] RFC 6544 (March 2012): "TCP Candidates with Interactive Connectivity Establishment (ICE)"./
    [132] RFC 3023 (January 2001): "XML Media Types"./
    [133] RFC 5502 (April 2009): "The SIP P-Served-User Private-Header (P-Header) for the 3GPP IP Multimedia (IM) Core Network (CN) Subsystem"./
    [134] RFC 7316 (July 2014): "The Session Initiation Protocol (SIP) P-Private-Network-Indication Private Header (P-Header)"./
    [135] RFC 4585 (July 2006): "Extended RTP Profile for Real-time Transport Control Protocol (RTCP)-Based Feedback (RTP/AVPF)"./
    [136] RFC 5104 (February 2008): "Codec Control Messages in the RTP Audio-Visual Profile with Feedback (AVPF)"./
    [137] RFC 5939 (September 2010): "Session Description Protocol (SDP) Capability Negotiation"./
    [138] ETSI ES 282 001: "Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); NGN Functional Architecture Release 1"./
    [139] Void./
    [140] Void./
    [141] Void./
    [142] RFC 6228 (May 2011): "Response Code for Indication of Terminated Dialog"./
    [143] RFC 6223 (April 2011): "Indication of support for keep-alive"./
    [144] RFC 4240 (December 2005): "Basic Network Media Services with SIP"./
    [145] RFC 5552 (May 2009): "SIP Interface to VoiceXML Media Services"./
    [146] RFC 6230 (May 2011): "Media Control Channel Framework"./
    [147] RFC 6231 (May 2011): "An Interactive Voice Response (IVR) Control Package for the Media Control Channel Framework"./
    [148] RFC 6505 (March 2012): "A Mixer Control Package for the Media Control Channel Framework"./
    [149] RFC 2046 (November 1996): "Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types"./
    [150] RFC 5621 (September 2009): "Message Body Handling in the Session Initiation Protocol (SIP)"./
    [151] RFC 3862 (August 2004): "Common Presence and Instant Messaging (CPIM): Message Format"./
    [152] RFC 3890 (September 2004): "A Transport Independent Bandwidth Modifier for the Session Description Protocol (SDP)"./
    [153] RFC 7254 (May 2014): "A Uniform Resource Name Namespace for the Global System for Mobile Communications Association (GSMA) and the International Mobile station Equipment Identity (IMEI)". /
    [154] RFC 4122 (July 2005): "A Universally Unique IDentifier (UUID) URN Namespace"./
    [155] RFC 7195 (May 2014): "Session Description Protocol (SDP) Extension for Setting Audio Media Streams over Circuit-Switched Bearers in the Public Switched Telephone Network (PSTN)"./
    [156] RFC 7006 (September 2013): "Miscellaneous Capabilities Negotiation in the Session Description Protocol (SDP)"./
    [157] RFC 5438 (January 2009): "Instant Message Disposition Notification (IMDN)"./
    [158] RFC 5373 (November 2008): "Requesting Answering Modes for the Session Initiation Protocol (SIP)"./
    [160] Void./
    [161] RFC 4288 (December 2005): "Media Type Specifications and Registration Procedures"./
    [162] RFC 7329 (August 2014): "A Session Identifier for the Session Initiation Protocol (SIP)"./
    [163] RFC 6026 (September 2010): "Correct Transaction Handling for 2xx Responses to Session Initiation Protocol (SIP) INVITE Requests"./
    [164] RFC 5658 (October 2009): "Addressing Record-Route issues in the Session Initiation Protocol (SIP)"./
    [165] RFC 5954 (August 2010): "Essential Correction for IPv6 ABNF and URI Comparison in RFC3261"./
    [166] RFC 4117 (June 2005): "Transcoding Services Invocation in the Session Initiation Protocol (SIP) using Third Party Call Control (3pcc)"./
    [167] RFC 4567 (July 2006): "Key Management Extensions for Session Description Protocol (SDP) and Real Time Streaming Protocol (RTSP)"./
    [168] RFC 4568 (July 2006): "Session Description Protocol (SDP) Security Descriptions for Media Streams"./
    [169] RFC 3711 (March 2004): "The Secure Real-time Transport Protocol (SRTP)"./
    [170] RFC 6043 (March 2011): "MIKEY-TICKET: Ticket-Based Modes of Key Distribution in Multimedia Internet KEYing (MIKEY)"./
    [171] RFC 4235 (November 2005): "An INVITE-Initiated Dialog Event Package for the Session Initiation Protocol (SIP)"./
    [172] RFC 6871 (February 2013): "SDP media capabilities Negotiation"./
    [173] RFC 4488 (May 2006): "Suppression of Session Initiation Protocol (SIP) REFER Method Implicit Subscription"./
    [174] Void./
    [175] RFC 7462 (March 2015): "URNs for the Alert-Info Header Field of the Session Initiation Protocol (SIP)"./
    [176] ANSI/J-STD-036-B: "Enhanced Wireless 9-1-1, Phase 2"./
    [177] Void./
    [178] RFC 4975 (September 2007): "The Message Session Relay Protocol (MSRP)"./
    [179] RFC 3859 (August 2004): "Common Profile for Presence (CPP)"./
    [180] RFC 3860 (August 2004): "Common Profile for Instant Messaging (CPIM)"./
    [181] RFC 2368 (July 1998): "The mailto URL scheme"./
    [182] RFC 4745 (February 2007): "Common Policy: A Document Format for Expressing Privacy Preferences"./
    [183] RFC 5318 (December 2008): "The Session Initiation Protocol (SIP) P-Refused-URI-List Private-Header (P-Header)"./
    [184] RFC 4538 (June 2006): "Request Authorization through Dialog Identification in the Session Initiation Protocol (SIP)"./
    [185] RFC 5547 (May 2009): "A Session Description Protocol (SDP) Offer/Answer Mechanism to Enable File Transfer"./
    [186] RFC 4483 (May 2006): "A Mechanism for Content Indirection in Session Initiation Protocol (SIP) Messages"./
    [187] draft-atarius-dispatch-meid-urn-04 (May 2014): "A Uniform Resource Name Namespace for the Device Identity and the Mobile Equipment Identity (MEID)". /
    Editor's note: The above document cannot be formally referenced until it is published as an RFC./
    [188] RFC 6679 (August 2012): "Explicit Congestion Notification (ECN) for RTP over UDP"./
    [189] RFC 3168 (September 2001): "The Addition of Explicit Congestion Notification (ECN) to IP"./
    [190] RFC 6809 (November 2012): "Mechanism to Indicate Support of Features and Capabilities in the Session Initiation Protocol (SIP)"./
    [204] RFC 5506 (April 2009): "Support for Reduced-Size Real-Time Transport Control Protocol (RTCP)"./
    [205] RFC 3611 (November 2003): "RTP Control Protocol Extended Reports (RTCP XR)"./
    [206] RFC 4796 (February 2007): "The Session Description Protocol (SDP) Content Attribute"./
    [207] Void./
    [208] Void./
    [209] Void./
    [210] Void./
    [211] Void./
    [212] RFC 20 (May 2011): "ASCII format for Network Interchange"./
    9. Qualification of ETSI:
    ETSI is recognized under the provisions of ITU-T Recommendations A.5 and A.6. Qualifying information is on file at TSB.
    10. Other (for any supplementary information):
    None
    Note: This form is based on Recommendation ITU-T A.5
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