Yealink SIP-T48G Administrator's Manual page 424

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Description:
Enables or disables the IP phone to play a warning tone when answering an
intercom call.
0-Disabled
1-Enabled
Note: It works only if the value of the parameter "features.intercom.allow" and
"features.auto_answer_tone.enable" are set to 1 (Enabled).
Web User Interface:
Features->Intercom->Intercom Tone
Phone User Interface:
Menu->Features->Intercom->Intercom Tone
features.intercom.barge
Description:
Enables or disables the IP phone to answer an incoming intercom call while there is
already an active call on the IP phone.
0-Disabled
1-Enabled
If it is set to 0 (Disabled), the IP phone will handle an incoming intercom call like a
waiting call while there is already an active call on the IP phone.
If it is set to 1 (Enabled), the IP phone will automatically answer the intercom call
while there is already an active call on the IP phone and place the active call on
hold.
Note: It works only if the value of the parameter "features.intercom.allow" is set to 1
(Enabled) and "call_waiting.enable" are set to 1 (Enabled).
Web User Interface:
Features->Intercom->Intercom Barge
Phone User Interface:
Menu->Features->Intercom->Intercom Barge
To configure intercom via web user interface:
1. Click on Features->Intercom.
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Parameters Permitted Values Default
0 or 1 0