Yealink W60P Administrator's Manual page 260

Administrator's Guide for W60P DECT IP Phones
Details of Configuration Parameters:
sip.timer_t1
Description:
Configures the SIP session timer T1 (in seconds).
T1 is an estimate of the Round Trip Time (RTT) of transactions between a SIP client and SIP
server.
Web User Interface:
Settings->SIP->SIP Session Timer T1 (0.5~10s)
Handset User Interface:
None
sip.timer_t2
Description:
Configures the SIP session timer T2 (in seconds).
Timer T2 represents the maximum retransmitting time of any SIP request message.
Web User Interface:
Settings->SIP->SIP Session Timer T2 (2~40s)
Handset User Interface:
None
sip.timer_t4
Description:
Configures the SIP session timer of T4 (in seconds).
T4 represents the maximum duration a message will remain in the network.
Web User Interface:
Settings->SIP->SIP Session Timer T4 (2.5~60s)
Handset User Interface:
None
To configure session timer via web user interface:
Click on Settings->SIP.
1.
Enter the desired value in the SIP Session Timer T1 (0.5~10s) field.
2.
Enter the desired value in the SIP Session Timer T2 (2~40s) field.
3.
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Parameters Permitted Values
Float from 0.5 to10
Float from 2 to 40
Float from 2.5 to 60
Default
0.5
4
5