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Matrix SPARSH VP710 User Guide
Session Timer
Session timer allows SIP sessions to refresh periodically through an UPDATE request, to determine whether a SIP
session is still active or not. Session timer is specified in RFC 4028.
IP phone supports two refresher modes: UAC and UAS
Whether the endpoint functions as a UAC or a UAS depends on the UA that initiates the SIP request. If the initiator
is configured as UAC, the other client or the SIP server will function as a UAS. If the initiator is configured as UAS,
the other client or the SIP server will function as a UAC.
The session expiration is negotiated via the Session-Expires header in the INVITE message. The negotiated
refresher is always the UAC and it will send an UPDATE request at the negotiated session expiration. The value
“refresher=uac” included in the UPDATE message means that the UAC performs the refresh.
Example of UPDATE message (UAC mode):
Procedure
Session timer can be configured using the configuration files or locally.
UPDATE sip:[email protected]:5060 SIP/2.0
Via: SIP/2.0/UDP 10.10.20.32:5060;branch=z9hG4bK2104991394
From: "10111" <sip:[email protected]:5060>;tag=2170397024
To: <sip:[email protected]:5060>;tag=200382096
Call-ID: [email protected]
CSeq: 2 UPDATE
Contact: <sip:[email protected]:5060>
Max-Forwards: 70
User-Agent: User-Agent:
MATRIX SPARSH VP710 58.80.196.2 00:1b:09:04:8e:3c
Session-Expires: 90;refresher=uac
Supported: timer
Content-Length: 0
Configuration File
<MAC>.cfg
Configure session timer.
For more information, refer
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