Yealink SIP-T48G - Manual (Page 143)

Advanced Phone Features
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To configure an intercom key via phone user interface:
1. Tap the DSS Key key.
2. Tap the desired line key.
3. Tap the gray box of the Type field.
4. Tap Intercom from the pull-down list.
5. Tap the gray box of the Account ID field.
6. Tap the desired line from the pull-down list.
7. (Optional.) Enter the string that will appear on the touch screen in the Label field.
8. Enter the remote extension number in the Value field.
9. Tap the Save soft key to accept the change or to cancel.
10. Tap the DSS Key key to return to the idle screen.
Intercom key is configurable via web user interface at the path DSSKey->Line Key.
To place an intercom call:
1. Tap the intercom key when the phone is idle.
The phone is automatically connected to the extension specified in the Value field.
2. Tap the intercom key again or the End Call soft key to end the intercom call.
The SIP-T48G IP phone supports to automatically answer an incoming intercom call by
default. The phone automatically plays a warning tone when it receives an incoming
intercom call. In addition, you can enable the phone to mute the microphone when it
automatically answers an incoming intercom call. You can also enable the phone to
automatically answer an incoming intercom call while there is already an active call on
the phone. The active call is placed on hold.