Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
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SIP server will function as a UAC. The session expiration is negotiated via the Session-Expires header in the INVITE mes-
sage. The negotiated refresher is always the UAC and it will send an UPDATE request at the negotiated session expir-
ation. The value “refresher=uac” included in the UPDATE message means that the UAC performs the refresh.
Example of UPDATE message (UAC mode):
UPDATE sip:1058@10.10.20.34:5060 SIP/2.0
Via: SIP/2.0/UDP 10.10.20.32:5060;branch=z9hG4bK2104991394
From: "10111" <sip:10111@10.2.1.48:5060>;tag=2170397024
To: <sip:1058@10.2.1.48:5060>;tag=200382096
Call-ID: 4_1556494084@10.10.20.32
CSeq: 2 UPDATE
Contact: <sip:10111@10.10.20.32:5060>
Max-Forwards: 70
User-Agent: Yealink SIP-T46G 28.82.0.20
Session-Expires: 90;refresher=uac
Supported: timer
Content-Length: 0
Topic
Session Timer Configuration
Session Timer Configuration
The following table lists the parameters you can use to configure session timer.
Parameter
account.X.session_timer.enable
[1]
<MAC>.cfg
Description It enables or disables the session timer.
Permitted
Values
0-Disabled
1-Enabled, the IP phone will send periodic UPDATE requests to refresh the session during a call.
Default 0
Web UI Account->Advanced->Session Timer
Parameter
account.X.session_timer.expires
[1]
<MAC>.cfg
Description
It configures the interval (in seconds) for refreshing the SIP session during a call. For example, an UPDATE
will be sent after 50% of its value has elapsed.
If it is set to 1800 (1800s), the IP phone will refresh the session during a call before 900 seconds.
Example:
account.1.session_timer.expires = 1800
Note: It works only if “account.X.session_timer.enable” is set to 1 (Enabled).
Permitted
Values
Integer from 90 to 7200
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