Yealink SIP-T48G Administrator's Manual page 416

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
2. Select the desired value from the pull-down list of Allow Mute.
3. Click Confirm to accept the change.
Intercom allows establishing an audio conversation directly. The IP phone can answer
intercom calls automatically. This feature depends on support from a SIP server.
Intercom is a useful feature in office environments to quickly connect with an operator or
secretary. Users can press an intercom key to automatically initiate an outgoing
intercom call with a remote extension.
Note
It is not applicable to SIP-T19(P) E2 IP phones.
Procedure
Intercom key can be configured using the configuration files or locally.
Configuration File
396
<y0000000000xx>.cfg
Assign an intercom key.
Parameters:
linekey.X.type/
programablekey.X.type/
expansion_module.X.key.Y.type
linekey.X.line/
expansion_module.X.key.Y.line
linekey.X.value/