Yealink SIP-T27P [290/841] Details of configuration parameters

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series IP Phones

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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

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

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)

Phone User Interface:

None

To configure session timer via web user interface:

1. Click on Settings->SIP.

2. Enter the desired value in the SIP Session Timer T1 (0.5~10s) field.

The default value is 0.5.

3. Enter the desired value in the SIP Session Timer T2 (2~40s) field.