Administrator’s Guide for SIP-T58V/T58A/T56A/CP960 IP Phones
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l
Callee does not answer
l
Callee actively rejects the incoming call before answering
Yealink phones support call completion using the SUBSCRIBE/NOTIFY method, which is specified in draft-poetzl-sip-
ping-call-completion-00, to subscribe to the busy party and receive notifications of their status changes.
The caller subscribes for update notifications of the dialog event from the busy party. Example of a SUBSCRIBE mes-
sage:
SUBSCRIBE sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.10.20.32:5060;branch=z9hG4bK2880274891
From: "10111" <sip:[email protected]:5060>;tag=8643512
To: <sip:[email protected]:5060>;tag=4025601441
Call-ID: [email protected]
CSeq: 2 SUBSCRIBE
Contact: <sip:[email protected]:5060>
Accept: application/dialog-info+xml
Max-Forwards: 70
User-Agent: Yealink T58 58.80.0.5
Expires: 60
Event: dialog
Content-Length: 0
Example of a NOTIFY message (The subscription (SUBSCRIBE message) of the dialog event “Call Completion” is con-
firmed by the busy party):
NOTIFY sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.10.20.31:5060;branch=z9hG4bK1830418099
From: <sip:[email protected]:5060>;tag=1032948194
To: "10111" <sip:[email protected]:5060>;tag=722495580
Call-ID: [email protected]
CSeq: 2 NOTIFY
Contact: <sip:[email protected]:5060>
Content-Type: application/dialog-info+xml
Max-Forwards: 70
User-Agent: Yealink T58 58.80.0.5
Subscription-State: active;expires=60
Event: dialog
Content-Length: 584
Summary of Contents for T5 Series
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