Yealink SIP-T2 SERIES Administrator's Manual page 375

Features->General Information->Use Outbound Proxy In Dialog
Phone User Interface:
None
To configure use outbound proxy in dialog via web user interface:
1. Click on Features->General Information.
2. Select the desired value from the pull-down list of Use Outbound Proxy In Dialog.
3. Click Confirm to accept the change.
SIP session timers T1, T2 and T4 are SIP transaction layer timers defined in
These session timers are configurable on IP phones.
Timer T1
Timer T1 is an estimate of the Round Trip Time (RTT) of transactions between a SIP client
and SIP server.
Timer T2
Timer T2 represents the maximum retransmitting time of any SIP request message. The
re-transmitting and doubling of T1 will continue until the retransmitting time reaches the
T2 value.
Example:
The user registers a SIP account for the IP phone and then set the value of Timer T1,
Timer T2 respectively (Timer T1: 0.5, Timer T2: 4). The SIP registration request message
Parameter
Configuring Basic Features
Permitted Values Default
RFC 3261.
353