SIP RFC support

Hi,

I’m looking for Asterisk’s RFC support for SIP and other (like RTP, RTCP, …) but can not find a reference.

The list of SIP RFCs is quite long, I assume that the following are fully supported:

RFC 3261 SIP: Session Initiation Protocol. (Obsoletes RFC2543)
(Updated by RFC3265, RFC3853) (Status: PROPOSED STANDARD)

RFC 3264 An Offer/Answer Model with Session Description Protocol (SDP). J.
(Obsoletes RFC2543) (Status: PROPOSED STANDARD)

RFC 3265 Session Initiation Protocol (SIP)-Specific Event Notification. (Obsoletes RFC2543)(Updates RFC3261) (Status: PROPOSED STANDARD)

RFC 3311 The Session Initiation Protocol UPDATE Method (RFC 3311)

But what about the following:

RFC 3325 Private Extensions to the Session Initiation Protocol (SIP) for Asserted Identity within Trusted Networks
RFC 3326 The Reason Header Field for the Session Initiation Protocol (SIP)
RFC 3428 Session Initiation Protocol Extension for Instant Messaging
RFC 3515 The Session Initiation Protocol (SIP) Refer Method
RFC 3891 The Session Inititation Protocol (SIP) ‘Replaces’ Header
RFC 3892 The SIP Referred-By Mechanism
SIP Authenticated Identity Body (AIB) Format (RFC 3893) (28500 bytes)
An Event State Publication Extension to the Session Initiation Protocol (SIP) (RFC 3903) (72062 bytes)
RFC 3911 The Session Inititation Protocol (SIP) ‘Join’ Header
RFC 3968 Registry for the Session Initiation Protocol (SIP)