The Session Initiation Protocol (SIP) was truly a wondrous idea and noble concept. Unfortunately, the IETF is "Design by Committee". That is what happened to SIP. Everybody had their own extensions they wanted to get famous for and we have the State of SIP today. If you are considering 2 or more vendors in your network, better have them do an interoperability test first. 2 people don't read an RFC the same way, plus they may not have implemented the same extensions so you don't know what you really have until interoperability is done.
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