Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series IP Phones
388
4.
Enter the desired value in the
SIP Session Timer T4 (2.5~60s)
field.
5.
Click
Confirm
to accept the change.
Session Timer
Session timer allows a periodic refresh of SIP sessions through an UPDATE request, to determine
whether a SIP session is still active. Session timer is specified in
. IP phones support 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):
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: Yealink SIP-T46G 28.82.0.20
Session-Expires: 90;refresher=uac
Supported: timer
Content-Length: 0
Содержание SIP-T19 E2 T4 Series
Страница 1: ...63 ...
Страница 532: ...Administrator s Guide for SIP T2 Series T19 P E2 T4 Series T5 Series IP Phones 510 ...
Страница 734: ...Administrator s Guide for SIP T2 Series T19 P E2 T4 Series T5 Series IP Phones 712 ...
Страница 814: ...Administrator s Guide for SIP T2 Series T19 P E2 T4 Series T5 Series IP Phones 792 ...
Страница 850: ...Administrator s Guide for SIP T2 Series T19 P E2 T4 Series T5 Series IP Phones 828 ...
Страница 887: ...Troubleshooting 865 The phone begins rebooting Any reboot of the phone may take a few minutes ...