The following describes the various standards supported. Even if not complete, it gives you an overview.
The SIP task extensions support SIP (Session Initiation Protocol), as defined by IETF. The tasks supports sending/receiving of the following SIP methods, defined in the Main SIP RFC (RFC 3261):
In addition the following SIP method extensions are supported:
Transport protocols supported are TCP, UDP and TLS.
In addition the following standards are supported: