The Digital Feature Telephone (DFT) or Keyset user is able to call
and automatically activate and speak through the speaker of another DFT
or Keyset in the same COM Group (a.k.a., an Intercom call). To make an
Intercom call, the user depresses the Intercom key or dials an access
code, and then dials the COM Group member number of the destination phone.
The destination's speaker and microphone, if so equipped, are automatically
activated.