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  • When a call is picked up by a different extension my phone still displays a - Missed Call - message, How can this be changed

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Solution

In the CANCEL message, the PBX has to send the "reason" header correctly according to RFC 3326 ("The Reason Header Field for the Session Initiation Protocol") in order to communicate to the phone that somebody else has picked up the call (this will work only as of firmware Version 7):


CANCEL sip:... 
CSeq: 8044 CANCEL
..
Reason: SIP;cause=200;text="Call completed elsewhere"
..