Yealink SIP-T48G Administrator's Manual page 576

Administrator's Guide for SIP-T2_Series_T4_Series IP Phones
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 3372—SIP for Telephones (SIP-T): Context and Architectures
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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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RFC 3486—Compressing the Session Initiation Protocol (SIP)
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RFC 3489—STUN - Simple Traversal of User Datagram Protocol (UDP) Through
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Network Address Translators (NATs)
RFC 3515—The Session Initiation Protocol (SIP) Refer Method
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RFC 3550—RTP , RTCP , IETF RFC 3550
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RFC 3556—Session Description Protocol (SDP) Bandwidth Modifiers for RTCP
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Bandwidth
RFC 3581—An Extension to the SIP for Symmetric Response Routing
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RFC 3608—SIP Extension Header Field for Service Route Discovery During
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Registration
RFC 3665—Session Initiation Protocol (SIP) Basic Call Flow Examples
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RFC 3666—SIP Public Switched Telephone Network (PSTN) Call Flows.
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RFC 3680—SIP Event Package for Registrations
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RFC 3702—Authentication, Authorization, and Accounting Requirements for the SIP
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RFC 3711—The Secure Real-time Transport Protocol (SRTP)
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RFC 3725—Best Current Practices for Third Party Call Control (3pcc) in the Session
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Initiation Protocol (SIP)
RFC 3842—A Message Summary and Message Waiting Indication Event Package
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for the Session Initiation Protocol (SIP)
RFC 3856—A Presence Event Package for Session Initiation Protocol (SIP)
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RFC 3863—Presence Information Data Format
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RFC 3890—A Transport Independent Bandwidth Modifier for the SDP
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RFC 3891—The Session Initiation Protocol (SIP) "Replaces" Header
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RFC 3892—The Session Initiation Protocol (SIP) Referred-By Mechanism
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RFC 3959—The Early Session Disposition Type for SIP
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RFC 3960—Early Media and Ringing Tone Generation in SIP
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RFC3966—The tel URI for telephone number
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