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SIP Extensions
1. Support PRACK method: enable SIP PRACK support.
2. Encode SIP URI with user parameter: encode user=phone parameter in
SIP URI.
3. Send INVITE with Timer header: encode Timer header in all INVITE
requests for ringing timeout
4. SIP session timer: enable SIP session timer function.
5. Conditional Call Forwarding Timer: Forward the call to the pre-configured
number if the phone does not pick up within the timer.
6. Disable Call Waiting: disable the call waiting tone.
7. Disable Caller-ID display: disable the caller-id display of incoming calls.
8. Call Hold using C=0.0.0.0: using the call hold method described in
RFC2543. If unchecked, the call hold would follow RFC3263 method
9. Send NOTIFY: send out NOTIFY request to transferor for unattended and
attended call transfer.