Yealink SIP-T23P [792/841] Rfc 3581 an extension to the sip for symmetric response routing

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series IP Phones

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 RFC 2543—SIP: Session Initiation Protocol

 RFC 2617—Http Authentication: Basic and Digest access authentication

 RFC 2782—A DNS RR for specifying the location of services (DNS SRV)

 RFC 2806—URLs for Telephone Calls

 RFC 2833—RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals

 RFC 2915—The Naming Authority Pointer (NAPTR) DNS Resource Record

 RFC 2976—The SIP INFO Method

 RFC 3087—Control of Service Context using SIP Request-URI

 RFC 3261—SIP: Session Initiation Protocol (replacement for RFC 2543)

 RFC 3262—Reliability of Provisional Responses in the Session Initiation Protocol (SIP)

 RFC 3263—Session Initiation Protocol (SIP): Locating SIP Servers

 RFC 3264—An Offer/Answer Model with the Session Description Protocol (SDP)

 RFC 3265—Session Initiation Protocol (SIP) - Specific Event Notification

 RFC 3266—Support for IPv6 in Session Description Protocol (SDP)

 RFC 3310—HTTP Digest Authentication Using Authentication and Key Agreement

(AKA)

 RFC 3311—The Session Initiation Protocol (SIP) UPDATE Method

 RFC 3312—Integration of Resource Management and SIP

 RFC 3313—Private SIP Extensions for Media Authorization

 RFC 3323—A Privacy Mechanism for the Session Initiation Protocol (SIP)

 RFC 3324—Requirements for Network Asserted Identity

 RFC 3325—SIP Asserted Identity

 RFC 3326—The Reason Header Field for the Session Initiation Protocol (SIP)

 RFC 3361—DHCP-for-IPv4 Option for SIP Servers

 RFC 3372—SIP for Telephones (SIP-T): Context and Architectures

 RFC 3398—ISUP to SIP Mapping

 RFC 3420—Internet Media Type message/sipfrag

 RFC 3428—Session Initiation Protocol (SIP) Extension for Instant Messaging

 RFC 3455—Private Header (P-Header) Extensions to the SIP for the 3GPP

 RFC 3486—Compressing the Session Initiation Protocol (SIP)

 RFC 3489—STUN - Simple Traversal of User Datagram Protocol (UDP) Through

Network Address Translators (NATs)

 RFC 3515—The Session Initiation Protocol (SIP) Refer Method

 RFC 3550—RTP: Transport Protocol for Real-Time Applications

 RFC 3555—MIME Type Registration of RTP Payload Formats

 RFC 3581—An Extension to the SIP for Symmetric Response Routing

 RFC 3608—SIP Extension Header Field for Service Route Discovery During

Registration