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Administrator’s Guide for SIP-T3xG IP Phones
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6. Select the desired refresher from the pull-down list of Refresher.
7. Click Confirm to accept the change.
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.
Procedure
Call hold can be configured using the configuration files or locally.
Configuration File <y0000000000xx>.cfg
Specify whether RFC 2543
(c=0.0.0.0) outgoing hold
signaling is used.
For more information, refer to Call
Hold on page 261 .
Local Web User Interface
Specify whether RFC 2543
(c=0.0.0.0) outgoing hold
signaling is used.