Yealink T5 Series Administrator's Guide

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:1000@10.10.20.34:5060 SIP/2.0
Via: SIP/2.0/UDP 10.10.20.32:5060;branch=z9hG4bK2880274891
From: "10111" <sip:10111@10.2.1.48:5060>;tag=8643512
To: <sip:1000@10.2.1.48:5060>;tag=4025601441
Call-ID: 4_2103527761@10.10.20.32
CSeq: 2 SUBSCRIBE
Contact: <sip:10111@10.10.20.32:5060>
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:10111@10.10.20.32:5060 SIP/2.0
Via: SIP/2.0/UDP 10.10.20.31:5060;branch=z9hG4bK1830418099
From: <sip:1000@10.2.1.48:5060>;tag=1032948194
To: "10111" <sip:10111@10.2.1.48:5060>;tag=722495580
Call-ID: 0_160090766@10.10.20.32
CSeq: 2 NOTIFY
Contact: <sip:1000@10.10.20.31:5060>
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

Yealink T5 Series Specifications

General

Brand	Yealink
Model	T5 Series
Category	IP Phone
Language	English