Yealink SIP-T48G Administrator's Manual page 850

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
The following RFC's and Internet drafts are supported:
RFC 1321—The MD5 Message-Digest Algorithm
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RFC 1889—RTP Media control
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RFC 2112—Multipart MIME
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RFC 2327—SDP: Session Description Protocol
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RFC 2387—The MIME Multipart/Related Content-type
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RFC 2543—SIP: Session Initiation Protocol
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RFC 2617—Http Authentication: Basic and Digest access authentication
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RFC 2782—A DNS RR for specifying the location of services (DNS SRV)
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RFC 2806—URLs for Telephone Calls
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RFC 2833—RTP Payload for DTMF Digits, Telephony Tones and Telephony Signals
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RFC 2915—The Naming Authority Pointer (NAPTR) DNS Resource Record
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RFC 2976—The SIP INFO Method
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RFC 3087—Control of Service Context using SIP Request-URI
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RFC 3261—SIP: Session Initiation Protocol (replacement for RFC 2543)
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RFC 3262—Reliability of Provisional Responses in the Session Initiation Protocol (SIP)
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RFC 3263—Session Initiation Protocol (SIP): Locating SIP Servers
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RFC 3264—An Offer/Answer Model with the Session Description Protocol (SDP)
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RFC 3265—Session Initiation Protocol (SIP) - Specific Event Notification
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RFC 3266—Support for IPv6 in Session Description Protocol (SDP)
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RFC 3310—HTTP Digest Authentication Using Authentication and Key Agreement
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(AKA)
RFC 3311—The Session Initiation Protocol (SIP) UPDATE Method
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RFC 3312—Integration of Resource Management and SIP
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RFC 3313—Private SIP Extensions for Media Authorization
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RFC 3323—A Privacy Mechanism for the Session Initiation Protocol (SIP)
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RFC 3324—Requirements for Network Asserted Identity
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RFC 3325—SIP Asserted Identity
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RFC 3326—The Reason Header Field for the Session Initiation Protocol (SIP)
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RFC 3361—DHCP-for-IPv4 Option for SIP Servers
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RFC 3372—SIP for Telephones (SIP-T): Context and Architectures
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RFC 3398—ISUP to SIP Mapping
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RFC 3420—Internet Media Type message/sipfrag
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RFC 3428—Session Initiation Protocol (SIP) Extension for Instant Messaging
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RFC 3455—Private Header (P-Header) Extensions to the SIP for the 3GPP
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