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    ITU-T A.5 justification information for referenced document ETSI TS 129 165 V10.21.0 (2016-01) in draft Q.3640
    1. Clear description of the referenced document:
    Title: Digital cellular telecommunications system (Phase 2+);Universal Mobile Telecommunications System (UMTS);LTE;Inter-IMS Network to Network Interface (NNI) (ETSI TS 129 165 V10.21.0)
    2. Status of approval:
    Approved
    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.harge 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:
    3GPP ETSI TS 129.165 was published in 2016-01. It is a ETSI standard document
    6. The degree of stability or maturity of the document:
    3GPP ETSI TS 129.165 was published in 2016-01. It is a ETSI standard document
    7. Relationship with other existing or emerging documents:
    [5] 3GPP TS 24.229: "INTERNET PROTOCOL (IP) MULTIMEDIA CALL CONTROL PROTOCOL BASED ON SESSION INITIATION PROTOCOL (SIP) AND SESSION DESCRIPTION PROTOCOL (SDP); STAGE 3". [13] IETF RFC 3261: "SIP: SESSION INITIATION PROTOCOL". [23] IETF RFC 3311: "THE SESSION INITIATION PROTOCOL (SIP) UPDATE METHOD".
    8. Any explicit references within that referenced document should also be listed:
    [1] 3GPP TR 21.905: "VOCABULARY FOR 3GPP SPECIFICATIONS"./
    [2] IETF RFC 791: "INTERNET PROTOCOL"./
    [3] 3GPP TS 23.002: "NETWORK ARCHITECTURE"./
    [4] 3GPP TS 23.228: "IP MULTIMEDIA SUBSYSTEM (IMS); STAGE 2"./
    [5] 3GPP TS 24.229: "INTERNET PROTOCOL (IP) MULTIMEDIA CALL CONTROL PROTOCOL BASED ON SESSION INITIATION PROTOCOL (SIP) AND SESSION DESCRIPTION PROTOCOL (SDP); STAGE 3"./
    [6] 3GPP TR 24.930: "SIGNALLING FLOWS FOR THE SESSION SETUP IN THE IP MULTIMEDIA CORE NETWORK SUBSYSTEM (IMS) BASED ON SESSION INITIATION PROTOCOL (SIP) AND SESSION DESCRIPTION PROTOCOL (SDP); STAGE 3"./
    [7] IETF RFC 2460: "INTERNET PROTOCOL, VERSION 6 (IPV6) SPECIFICATION"./
    [8] 3GPP TS 29.162: "INTERWORKING BETWEEN THE IM CN SUBSYSTEM AND IP NETWORKS"./
    [9] 3GPP TS 22.228: "SERVICE REQUIREMENTS FOR THE IP MULTIMEDIA CORE NETWORK SUBSYSTEM"./
    [10] 3GPP TS 33.210: "3G SECURITY; NETWORK DOMAIN SECURITY (NDS); IP NETWORK LAYER SECURITY"./
    [11] 3GPP TS 26.114: "IP MULTIMEDIA SUBSYSTEM (IMS); MULTIMEDIA TELEPHONY; MEDIA HANDLING AND INTERACTION"./
    [12] ETSI TS 181 005 1.1.1: "TELECOMMUNICATIONS AND INTERNET CONVERGED SERVICES AND PROTOCOLS FOR ADVANCED NETWORKING (TISPAN); SERVICES AND CAPABILITIES REQUIREMENTS"./
    [13] IETF RFC 3261: "SIP: SESSION INITIATION PROTOCOL"./
    [14] IETF RFC 3966: "THE TEL URI FOR TELEPHONE NUMBERS"./
    [15] IETF RFC 3860: "COMMON PROFILE FOR INSTANT MESSAGING (CPIM)"./
    [16] IETF RFC 3859: "COMMON PROFILE FOR PRESENCE (CPP)"./
    [17] IETF RFC 4975: "THE MESSAGE SESSION RELAY PROTOCOL (MSRP)"./
    [18] IETF RFC 3262: "RELIABILITY OF PROVISIONAL RESPONSES IN SESSION INITIATION PROTOCOL (SIP)"./
    [19] IETF RFC 3428: "SESSION INITIATION PROTOCOL (SIP) EXTENSION FOR INSTANT MESSAGING"./
    [20] IETF RFC 3265: "SESSION INITIATION PROTOCOL (SIP) SPECIFIC EVENT NOTIFICATION"./
    [21] IETF RFC 3903: "AN EVENT STATE PUBLICATION EXTENSION TO THE SESSION INITIATION PROTOCOL (SIP)"./
    [22] IETF RFC 3515: "THE SESSION INITIATION PROTOCOL (SIP) REFER METHOD"./
    [23] IETF RFC 3311: "THE SESSION INITIATION PROTOCOL (SIP) UPDATE METHOD"./
    [24] IETF RFC 3455: "PRIVATE HEADER (P-HEADER) EXTENSIONS TO THE SESSION INITIATION PROTOCOL (SIP) FOR THE 3RD-GENERATION PARTNERSHIP PROJECT (3GPP)"./
    [25] IETF RFC 4244: "AN EXTENSION TO THE SESSION INITIATION PROTOCOL (SIP) FOR REQUEST HISTORY INFORMATION"./
    [26] IETF RFC 6050: "A SESSION INITIATION PROTOCOL (SIP) EXTENSION FOR THE IDENTIFICATION OF SERVICES"./
    [27] IETF RFC 4168: "THE STREAM CONTROL TRANSMISSION PROTOCOL (SCTP) AS A TRANSPORT FOR THE SESSION INITIATION PROTOCOL (SIP)"./
    [28] VOID./
    [29] 3GPP TS 32.260: "TELECOMMUNICATION MANAGEMENT; CHARGING MANAGEMENT; IP MULTIMEDIA SUBSYSTEM (IMS) CHARGING"./
    [30] 3GPP TS 22.173: "IP MULTIMEDIA CORE NETWORK SUBSYSTEM (IMS); MULTIMEDIA TELEPHONY SERVICE AND SUPPLEMENTARY SERVICES; STAGE 1"./
    [31] 3GPP TS 24.173: "IMS MULTIMEDIA TELEPHONY COMMUNICATION SERVICE AND SUPPLEMENTARY SERVICES; STAGE 3"./
    [32] 3GPP TS 24.607: "ORIGINATING IDENTIFICATION PRESENTATION (OIP) AND ORIGINATING IDENTIFICATION RESTRICTION (OIR) USING IP MULTIMEDIA (IM); CORE NETWORK (CN) SUBSYSTEM"./
    [33] 3GPP TS 24.616: "MALICIOUS COMMUNICATION IDENTIFICATION (MCID) USING IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [34] IETF RFC 3323: "A PRIVACY MECHANISM FOR THE SESSION INITIATION PROTOCOL (SIP)"./
    [35] 3GPP TS 23.003: "NUMBERING, ADDRESSING AND IDENTIFICATION"./
    [36] 3GPP TS 24.610: "COMMUNICATION HOLD (HOLD) USING IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [37] 3GPP TS 24.615: "COMMUNICATION WAITING (CW) USING IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [38] 3GPP TS 24.628: "COMMON BASIC COMMUNICATION PROCEDURES USING IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [39] IETF RFC 6086: "SESSION INITIATION PROTOCOL (SIP) INFO METHOD AND PACKAGE FRAMEWORK"./
    [40] IETF RFC 3312: "INTEGRATION OF RESOURCE MANAGEMENT AND SESSION INITIATION PROTOCOL (SIP)"./
    [41] IETF RFC 4032: "UPDATE TO THE SESSION INITIATION PROTOCOL (SIP) PRECONDITIONS FRAMEWORK"./
    [42] IETF RFC 3313: "PRIVATE SESSION INITIATION PROTOCOL (SIP) EXTENSIONS FOR MEDIA AUTHORIZATION"./
    [43] IETF RFC 3327: "SESSION INITIATION PROTOCOL EXTENSION HEADER FIELD FOR REGISTERING NON-ADJACENT CONTACTS"./
    [44] IETF RFC 3325: "PRIVATE EXTENSIONS TO THE SESSION INITIATION PROTOCOL (SIP) FOR NETWORK ASSERTED IDENTITY WITHIN TRUSTED NETWORKS"./
    [45] IETF RFC 3608: "SESSION INITIATION PROTOCOL (SIP) EXTENSION HEADER FIELD FOR SERVICE ROUTE DISCOVERY DURING REGISTRATION"./
    [46] IETF RFC 3486: "COMPRESSING THE SESSION INITIATION PROTOCOL (SIP)"./
    [47] IETF RFC 3329: "SECURITY MECHANISM AGREEMENT FOR THE SESSION INITIATION PROTOCOL (SIP)"./
    [48] IETF RFC 3326: "THE REASON HEADER FIELD FOR THE SESSION INITIATION PROTOCOL (SIP)"./
    [49] IETF RFC 6432: "CARRYING Q.850 CODES IN REASON HEADER FIELDS IN SIP (SESSION INITIATION PROTOCOL) RESPONSES"./
    [50] IETF RFC 3581: "AN EXTENSION TO THE SESSION INITIATION PROTOCOL (SIP) FOR SYMMETRIC RESPONSE ROUTING"./
    [51] IETF RFC 3841: "CALLER PREFERENCES FOR THE SESSION INITIATION PROTOCOL (SIP)"./
    [52] IETF RFC 4028: "SESSION TIMERS IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [53] IETF RFC 3892: "THE SESSION INITIATION PROTOCOL (SIP) REFERRED-BY MECHANISM"./
    [54] IETF RFC 3891: "THE SESSION INITITATION PROTOCOL (SIP) 'REPLACES' HEADER"./
    [55] IETF RFC 3911: "THE SESSION INITITATION PROTOCOL (SIP) 'JOIN' HEADER"./
    [56] IETF RFC 3840: "INDICATING USER AGENT CAPABILITIES IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [57] IETF RFC 5079: "REJECTING ANONYMOUS REQUESTS IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [58] IETF RFC 4458: "SESSION INITIATION PROTOCOL (SIP) URIS FOR APPLICATIONS SUCH AS VOICEMAIL AND INTERACTIVE VOICE RESPONSE (IVR)"./
    [59] IETF RFC 4320: "ACTIONS ADDRESSING IDENTIFIED ISSUES WITH THE SESSION INITIATION PROTOCOL'S (SIP) NON-INVITE TRANSACTION"./
    [60] IETF RFC 4457: "THE SESSION INITIATION PROTOCOL (SIP) P-USER-DATABASE PRIVATE-HEADER (P-HEADER)"./
    [61] IETF RFC 5031: "A UNIFORM RESOURCE NAME (URN) FOR SERVICES"./
    [62] IETF RFC 5627: "OBTAINING AND USING GLOBALLY ROUTABLE USER AGENT (UA) URIS (GRUU) IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [63] VOID/
    [64] IETF RFC 5002: "THE SESSION INITIATION PROTOCOL (SIP) P-PROFILE-KEY PRIVATE HEADER (P-HEADER)"./
    [65] IETF RFC 5626: "MANAGING CLIENT-INITIATED CONNECTIONS IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [66] IETF 5768: "INDICATING SUPPORT FOR INTERACTIVE CONNECTIVITY ESTABLISHMENT (ICE) IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [67] IETF RFC 5365: "MULTIPLE-RECIPIENT MESSAGE REQUESTS IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [68] IETF RFC 6442: "LOCATION CONVEYANCE FOR THE SESSION INITIATION PROTOCOL"./
    [69] IETF RFC 5368: "REFERRING TO MULTIPLE RESOURCES IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [70] IETF RFC 5366: "CONFERENCE ESTABLISHMENT USING REQUEST-CONTAINED LISTS IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [71] IETF RFC 5367: "SUBSCRIPTIONS TO REQUEST-CONTAINED RESOURCE LISTS IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [72] IETF RFC 4967: "DIAL STRING PARAMETER FOR THE SESSION INITIATION PROTOCOL UNIFORM RESOURCE IDENTIFIER"./
    [73] IETF RFC 4964: "THE P-ANSWER-STATE HEADER EXTENSION TO THE SESSION INITIATION PROTOCOL FOR THE OPEN MOBILE ALLIANCE PUSH TO TALK OVER CELLULAR"./
    [74] IETF RFC 5009: "PRIVATE HEADER (P-HEADER) EXTENSION TO THE SESSION INITIATION PROTOCOL (SIP) FOR AUTHORIZATION OF EARLY MEDIA"./
    [75] IETF RFC 4694: "NUMBER PORTABILITY PARAMETERS FOR THE 'TEL' URI"./
    [76] VOID/
    [77] IETF RFC 4411: "EXTENDING THE SESSION INITIATION PROTOCOL (SIP) REASON HEADER FOR PREEMPTION EVENTS"./
    [78] IETF RFC 4412: "COMMUNICATIONS RESOURCE PRIORITY FOR THE SESSION INITIATION PROTOCOL (SIP)"./
    [79] IETF RFC 5393: "ADDRESSING AN AMPLIFICATION VULNERABILITY IN SESSION INITIATION PROTOCOL (SIP) FORKING PROXIES"./
    [80] IETF RFC 5049: "APPLYING SIGNALING COMPRESSION (SIGCOMP) TO THE SESSION INITIATION PROTOCOL (SIP)"./
    [81] IETF RFC 5688: "A SESSION INITIATION PROTOCOL (SIP) MEDIA FEATURE TAG FOR MIME APPLICATION SUB-TYPES"./
    [82] IETF RFC 5360: "A FRAMEWORK FOR CONSENT-BASED COMMUNICATIONS IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [83] DRAFT-IETF-CUSS-SIP-UUI-04 (OCTOBER 2011): "A MECHANISM FOR TRANSPORTING USER TO USER CALL CONTROL INFORMATION IN SIP"./
    [83A] DRAFT-IETF-CUSS-SIP-UUI-ISDN-02 (FEBRUARY 2012): "INTERWORKING ISDN CALL CONTROL USER INFORMATION WITH SIP"./
    [84] DRAFT-VANELBURG-DISPATCH-PRIVATE-NETWORK-IND-01 (JUNE 2010): "THE SESSION INITIATION PROTOCOL (SIP) P-PRIVATE-NETWORK-INDICATION PRIVATE-HEADER (P-HEADER)"./
    [85] IETF RFC 5502: "THE SIP P-SERVED-USER PRIVATE-HEADER (P-HEADER) FOR THE 3GPP IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [86] VOID./
    [87] DRAFT-DAWES-SIPPING-DEBUG-04 (FEBRUARY 2011): " SESSION INITIATION PROTOCOL (SIP) HEADER PARAMETER FOR DEBUGGING"./
    [88] IETF RFC 6228: "RESPONSE CODE FOR INDICATION OF TERMINATED DIALOG"./
    [89] IETF RFC 5621: "MESSAGE BODY HANDLING IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [90] IETF RFC 6223: "INDICATION OF SUPPORT FOR KEEP-ALIVE"./
    [91] IETF RFC 5552: "SIP INTERFACE TO VOICEXML MEDIA SERVICES"./
    [92] IETF RFC 3862: "COMMON PRESENCE AND INSTANT MESSAGING (CPIM): MESSAGE FORMAT"./
    [93] IETF RFC 5438: "INSTANT MESSAGE DISPOSITION NOTIFICATION"./
    [94] IETF RFC 5373: "REQUESTING ANSWERING MODES FOR THE SESSION INITIATION PROTOCOL (SIP)". /
    [95] VOID/
    [96] IETF RFC 3959: "THE EARLY SESSION DISPOSITION TYPE FOR THE SESSION INITIATION PROTOCOL (SIP)"./
    [97] VOID./
    [98] 3GPP TS 24.183: "CUSTOMIZED RINGING SIGNAL (CRS) USING IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [99] 3GPP TS 24.259: "PERSONAL NETWORK MANAGEMENT (PNM) USING IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [100] 3GPP TS 24.238: "SESSION INITIATION PROTOCOL (SIP) BASED USER CONFIGURATION"./
    [101] 3GPP TS 24.239: "FLEXIBLE ALERTING (FA) USING IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [102] VOID./
    [103] 3GPP TS 24.654: "CLOSED USER GROUP (CUG) USING IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [104] VOID./
    [105] 3GPP TS 24.605: "CONFERENCE (CONF) USING IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [106] 3GPP TS 24.147: "CONFERENCING USING THE IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [107] VOID./
    [108] VOID. /
    [109] 3GPP TS 24.642: "COMPLETION OF COMMUNICATIONS TO BUSY SUBSCRIBER (CCBS) COMPLETION OF COMMUNICATIONS BY NO REPLY (CCNR) USING IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [110] VOID./
    [111] VOID./
    [112] 3GPP TS 24.606: "MESSAGE WAITING INDICATION (MWI) USING IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [113] 3GPP TS 24.608: "TERMINATING IDENTIFICATION PRESENTATION (TIP) AND TERMINATING IDENTIFICATION RESTRICTION (TIR) USING IP MULTIMEDIA (IM); CORE NETWORK (CN) SUBSYSTEM"./
    [114] 3GPP TS 24.611: "COMMUNICATION BARRING (CB) USING IP MULTIMEDIA (IM); CORE NETWORK (CN) SUBSYSTEM"./
    [115] VOID./
    [116] 3GPP TS 24.629: "EXPLICIT COMMUNICATION TRANSFER (ECT) USING IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [117] 3GPP TS 24.604: "COMMUNICATION DIVERSION (CDIV) USING IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [118] VOID./
    [119] VOID./
    [120] 3GPP TS 23.292: "IP MULTIMEDIA SUBSYSTEM (IMS) CENTRALIZED SERVICES; STAGE 2"./
    [121] 3GPP TS 24.292: "IP MULTIMEDIA CORE NETWORK SUBSYSTEM CENTRALIZED SERVICES (ICS); STAGE 3"./
    [122] 3GPP TS 24.647: "ADVICE OF CHARGE (AOC) USING IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [123] VOID./
    [124] DRAFT-KAPLAN- DISPATCH -SESSION-ID-00 (DECEMBER 2009): "A SESSION IDENTIFIER FOR THE SESSION INITIATION PROTOCOL (SIP)"./
    [125] IETF RFC 6026: "CORRECT TRANSACTION HANDLING FOR 2XX RESPONSES TO SESSION INITIATION PROTOCOL (SIP) INVITE REQUESTS"./
    [126] IETF RFC 5658: "ADDRESSING RECORD-ROUTE ISSUES IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [127] IETF RFC 5954: "ESSENTIAL CORRECTION FOR IPV6 ABNF AND URI COMPARISON IN RFC3261"./
    [128] VOID./
    [129] 3GPP TS 24.182: "IP MULTIMEDIA SUBSYSTEM (IMS) CUSTOMIZED ALERTING TONES (CAT)"./
    [130] 3GPP TS 29.292: "INTERWORKING BETWEEN THE IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM AND MSC SERVER FOR IMS CENTRALIZED SERVICES (ICS)"./
    [131] 3GPP TS 24.237: "IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM; IP MULTIMEDIA SUBSYSTEM (IMS) SERVICE CONTINUITY"./
    [132] 3GPP TS 24.141: "PRESENCE SERVICE USING THE IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [133] DRAFT-IETF-SIP-SESSION-POLICY-FRAMEWORK-10 (FEBRUARY 2011): "A FRAMEWORK FOR SESSION INITIATION PROTOCOL (SIP) SESSION POLICIES"./
    [134] IETF RFC 5875: "AN EXTENSIBLE MARKUP LANGUAGE (XML) CONFIGURATION ACCESS PROTOCOL (XCAP) DIFF EVENT PACKAGE"./
    [135] IETF RFC 4488: "SUPPRESSION OF SESSION INITIATION PROTOCOL (SIP) REFER METHOD IMPLICIT SUBSCRIPTION"./
    [136] DRAFT-IETF-SALUD-ALERT-INFO-URNS-00(DECEMBER 2010): "ALERT-INFO URNS FOR FOR THE SESSION INITIATION PROTOCOL (SIP)"./
    [137] DRAFT-DAWES-DISPATCH-MEDIASEC-PARAMETER-04 (AUGUST 2011): "CAPABILITY EXCHANGE FOR MEDIA PLANE SECURITY"./
    [138] OMA-TS-PRESENCE_SIMPLE-V2_0-20101202 "PRESENCE SIMPLE SPECIFICATION"./
    [139] 3GPP TS 24.247: "MESSAGING SERVICE USING THE IP MULTIMEDIA (IM) CORE NETWORK (CN) SUBSYSTEM"./
    [140] IETF RFC 4538: "REQUEST AUTHORIZATION THROUGH DIALOG IDENTIFICATION IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [141] IETF RFC 5318: "THE SESSION INITIATION PROTOCOL (SIP) P-REFUSED-URI-LIST PRIVATE-HEADER (P-HEADER)"./
    [142] OMA-TS-PRESENCE_SIMPLE-V1_1-20100225 "PRESENCE SIMPLE SPECIFICATION"./
    [143] DRAFT-HOLMBERG-SIPCORE-PROXY-FEATURE-04 (DECEMBER 2011): "INDICATION OF FEATURES SUPPORTED BY PROXY"./
    [144] IETF RFC 5839: "AN EXTENSION TO SESSION INITIATION PROTOCOL (SIP) EVENTS FOR CONDITIONAL EVENT NOTIFICATION"./
    [145] VOID./
    [146] IETF RFC 3264: "AN OFFER/ANSWER MODEL WITH THE SESSION DESCRIPTION PROTOCOL (SDP)"./
    [147] IETF RFC 4566: "SDP: SESSION DESCRIPTION PROTOCOL"./
    [148] 3GPP TS 29.079: "OPTIMAL MEDIA ROUTEING WITHIN THE IP MULTIMEDIA SUBSYSTEM; STAGE 3"./
    [149] 3GPP TS 24.337: "IP MULTIMEDIA SUBSYSTEM (IMS) INTER-UE TRANSFER"./
    [150] IETF RFC 3960: "EARLY MEDIA AND RINGING TONE GENERATION IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [151] IETF RFC 3550: "RTP: A TRANSPORT PROTOCOL FOR REAL-TIME APPLICATIONS"./
    [152] IETF RFC 768: "USER DATAGRAM PROTOCOL"./
    [153] IETF RFC 3551: "RTP PROFILE FOR AUDIO AND VIDEO CONFERENCES WITH MINIMAL CONTROL"./
    [154] IETF RFC 3556: "SESSION DESCRIPTION PROTOCOL (SDP) BANDWIDTH MODIFIERS FOR RTP CONTROL PROTOCOL (RTCP) BANDWIDTH"./
    [155] IETF RFC 4585: "EXTENDED RTP PROFILE FOR REAL-TIME TRANSPORT CONTROL PROTOCOL (RTCP)-BASED FEEDBACK (RTP/AVPF)"./
    [156] IETF RFC 793: "TRANSMISSION CONTROL PROTOCOL"./
    [157] IETF RFC 4733: "RTP PAYLOAD FOR DTMF DIGITS, TELEPHONY TONES, AND TELEPHONY SIGNALS"./
    [158] IETF RFC 4916: "CONNECTED IDENTITY IN THE SESSION INITIATION PROTOCOL (SIP)"./
    [159] 3GPP TS 23.237: "IP MULTIMEDIA SUBSYSTEM (IMS) SERVICE CONTINUITY "/
    [160] IETF RFC 4145: "TCP-Based Media Transport in the Session Description Protocol (SDP)"./
    [161] 3GPP TS 32.240: "Telecommunication management; Charging management; Charging/
    architecture and principles"./
    [162] Void./
    [163] 3GPP TS 29.658: "SIP Transfer of IP Multimedia Service Tariff Information"./
    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):
    Note: This form is based on Recommendation ITU-T A.5
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