Yealink SIP-T21 E2

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
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Procedure
SIP session timer can be configured using the following methods.
Central Provisioning
(Configuration File)
<y0000000000xx>.cfg
Configure SIP session timer.
Parameters:
sip.timer_t1
sip.timer_t2
sip.timer_t4
Web User Interface
Configure SIP session timer.
Navigate to:
http://<phoneIPAddress>/servlet?p
=settings-sip&q=load
Details of Configuration Parameters:
Parameters
Permitted Values
Default
sip.timer_t1
Float from 0.5 to10
0.5
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)
Phone User Interface:
None
sip.timer_t2
Float from 2 to 40
4
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)
Phone User Interface:
None
sip.timer_t4
Float from 2.5 to 60
5