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[RFC 3508] H.323 Uniform Resource Locator (URL) Scheme Registration.
[RFC 3762] Telephone Number Mapping (ENUM) Service Registration for H.323.
[RFC 4245] High-Level Requirements for Tightly Coupled SIP Conferencing.
[RFC 4488] Suppression of Session Initiation Protocol (SIP) REFER Method Implicit Subscription.
[RFC 4508] Conveying Feature Tags with the Session Initiation Protocol (SIP) REFER Method.
[RFC 4579] Session Initiation Protocol (SIP) Call Control - Conferencing for User Agents.
[RFC 5367] Subscriptions to Request-Contained Resource Lists in the Session Initiation Protocol (SIP).