Call Hold - Yealink SIP T46G Administrator's Manual

Administrator's Guide for SIP-T46G IP Phone
To configure the session timer via web user interface:
1. Click on Account.
2. Select the desired account from the pull-down list of Account.
3. Click on Advanced.
4. Select the desired value from the pull-down list of Enable Session Timer.
5. Enter the desired time interval in the Session Expires (Seconds) field.
6. Select the desired refresher from the pull-down list of Session Refresher.
7. Click Confirm to accept the change.
The call hold feature provides a service of putting an active call on hold. When a call is
placed on hold, the IP phone sends an INVITE request with a HOLD SDP to the server.
The IP phones support two call hold methods, one is RFC 3264, it is used to set the ―a‖
(media attribute) in the SDP to sendonly, recvonly or inactive, for example: a=sendonly.
The other is RFC 2543, it is used to set the ―c‖ (connection addresses for the media
streams) in the SDP to zero, for example: c=0.0.0.0. The call hold tone feature allows the
IP phones to play a hold tone at regular intervals when there is a call on hold.
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