Yealink CP860 [143/417] Call hold

Configuring Basic Features

131

Parameters

Permitted Values

Default

Description:

Configures the session timer of T4 (in seconds).

T4 represents the maximum duration a message will remain in the network.

Web User Interface:

Account->Advanced->SIP Session Timer T4 (2.5~60s)

Phone User Interface:

None

To configure session timer via web user interface:

1. Click on Account->Advanced.

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

The default value is 0.5s.

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

The default value is 4s.

4. Enter the desired value in the SIP Session Timer T4 (2.5~60s) field.

The default value is 5s.

5. Click Confirm to accept the change.

Call hold provides a service of placing an active call on hold. When a call is placed on

hold, the IP phones send an INVITE request with HOLD SDP to request remote parties to

stop sending media and to inform them that they are being held. IP phones support two

call hold methods, one is RFC 3264, which sets the “a” (media attribute) in the SDP to

sendonly, recvonly or inactive (e.g., a=sendonly). The other is RFC 2543, which sets the