Yealink SIP-T2 SERIES Administrator's Manual page 376

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
will be re-transmitted between the IP phone and SIP server. The re-transmitting and
doubling of Timer T1 (0.5) will continue until the retransmitting time reaches the Timer T2
(4). The total registration request retry time will be less than 64 times of T1 (64 * 0.5 = 32).
The re-transmitting interval in sequence is: 0.5s, 1s, 2s, 4s, 4s, 4s, 4s, 4s, 4s and 4s.
Timer T4
Timer T4 represents the time the network will take to clear messages between the SIP
client and server.
Procedure
SIP session timer can be configured using the configuration files or locally.
Configuration File
Local
Details of Configuration Parameters:
sip.timer_t1
354
<y0000000000xx>.cfg
Web User Interface
Parameters
Configure SIP session timer.
Parameters:
sip.timer_t1
sip.timer_t2
sip.timer_t4
Configure SIP session timer.
Navigate to:
For
SIP-T48G/T46G/T42G/T41P/T40P/T2
9G/T27P/T23P/T23G/T21(P)
E2/T19(P) E2/CP860:
http://<phoneIPAddress>/servlet
?p=settings-sip&q=load
For SIP VP-T49G:
http://<phoneIPAddress>/servlet
?m=mod_data&p=settings-sip&q
=load
Permitted Values
Float from 0.5 to10
Default
0.5