RCA 25404 - Manual (Page 29)

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Operation
To disconnect one party:
Press the line button for the person you want to continue speaking with, and the other party is automatically disconnected.
To disconnect both parties:
Hang up the handset, or press the SPEAKER or HEADSET button.
NOTE: If you press the HOLD button to put them on hold first, you may then disconnect from each party individually.
Intercom Calls
One -Touch Intercom
NOTE: If the INTERCOM indicator is turned on (solid red), the intercom is in use. You must wait until the indicator turns off before making an intercom call.
1. Press the Intercom/Memo Log button (1-16) for the station you want to intercom with. The SPEAKER turns on.
Alternately, you may press the INTERCOM button, then press the Intercom/Memo Log button (1-16) for the stations you want to intercom
with. The speakerphone automatically turns on.
NOTE: If you want to switch to the handset, pick it up and continue speaking. To switch to the headset press the HEADSET button.
NOTE: The handset, headset, or speakerphone cannot be active when an intercom call is initiated (the handset should be on the cradle and the speakerphone and
headset turned OFF.)
NOTE: To abort intercom call, press SPEAKER button.
2. To end the intercom call, hang up.
NOTE: If the receiving station does not answer within 45 seconds, the intercom call is cancelled. You will hear an error tone and NO ANSWER shows in the display.
Answering an Intercom Call
When you receive an INTERCOM call, the INTERCOM indicator flashes red, and the display shows the caller’s name and phone ID.