Yealink W60P Administrator's Manual page 501

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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RFC 3966—The tel URI for telephone number
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RFC 3968—IANA Registry for SIP Header Field
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RFC 3969—IANA Registry for SIP URI
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RFC 4028—Session Timers in the Session Initiation Protocol (SIP)
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RFC 4083—3GPP Release 5 Requirements on SIP
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RFC 4235—An INVITE-Initiated Dialog Event Package for the Session Initiation Protocol
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(SIP)
RFC 4244—An Extension to the SIP for Request History Information
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RFC 4317—Session Description Protocol (SDP) Offer/Answer Examples
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RFC 4353—A Framework for Conferencing with the SIP
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RFC 4458—SIP URIs for Applications such as Voicemail and Interactive Voice Response
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(IVR)
RFC 4475—Session Initiation Protocol (SIP) Torture
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RFC 4485—Guidelines for Authors of Extensions to the SIP
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RFC 4504—SIP Telephony Device Requirements and Configuration
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RFC 4566—SDP: Session Description Protocol.
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RFC 4568—Session Description Protocol (SDP) Security Descriptions for Media Streams
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RFC 4575—A SIP Event Package for Conference State
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RFC 4579—SIP Call Control - Conferencing for User Agents
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RFC 4583—Session Description Protocol (SDP) Format for Binary Floor Control Protocol
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(BFCP) Streams
RFC 4662—A SIP Event Notification Extension for Resource Lists
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RFC 4730—Event Package for KPML
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RFC 5009—P-Early-Media Header
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RFC 5079—Rejecting Anonymous Requests in SIP
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RFC 5359—Session Initiation Protocol Service Examples
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RFC 5589—Session Initiation Protocol (SIP) Call Control – Transfer
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RFC 5630—The Use of the SIPS URI Scheme in SIP
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RFC 5806—Diversion Indication in SIP
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RFC 5954—Essential Correction for IPv6 ABNF and URI Comparison in RFC 3261
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RFC 6026—Correct Transaction Handling for 2xx Responses to SIP INVITE Requests
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RFC 6141—Re-INVITE and Target-Refresh Request Handling in SIP
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Appendix
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