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The intercom turns a conference room on your PBX into a push-to-talk channel. Everyone who dials the same channel is on the same channel, and your microphone is shut until you hold the button down. It is off by default, because it takes the Voicemail tab’s slot. Turn it on in Settings › Calling › Intercom; voicemail stays reachable from the button in the Recents header.

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Channels and rooms

The intercom tab listing one saved room A channel is a conference extension your administrator has set up. The screen lists the rooms you have used, newest first, because rejoining one is what you will almost always be doing. + in the header dials a new one. The New channel sheet with its own keypad Rooms are remembered on the attempt, not on success — a channel you mistyped is worth seeing in the list so you can tell what you actually dialled, and a room that was busy is one you will want to try again.

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PINs

A room card expanded, showing PIN, Join and a delete button Tap a room to open it. PIN sets the code for that room; it is sent as tones once the room answers, and there is a retry a few seconds later because an IVR that is still talking drops digits sent too early. A saved PIN is never shown back to you — the card reads PIN saved, and Change replaces it. Leave it empty for a room that has none.

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In a channel

The channel screen is a large ring you hold. The ring tracks real audio: your own level while you are talking, the room’s while you are not. Around it:
  • Channel number and a quality line — Excellent, Good, Fair, Poor, Very poor or Measuring… — with the jitter and the codec in use.
  • Signal bars, or a dash while the media stack has not rated the call. An absent reading is shown as absent rather than as a bad one.
  • Speaker, Keypad and Leave.
The keypad sends tones into the conference, which is how conference commands work — *6 to mute the room on a stock FreeSWITCH dialplan, and whatever else yours defines.
The microphone is open only while the button is held. There is no tap-to-latch, deliberately: a latch you forget is a hot microphone in a room full of people, and the caption under the button says so on every screen.
If the channel drops, the screen stays where it is with Rejoin and Rooms, rather than throwing you back to the list — you are still at the channel, and losing your place reads like the app losing the call.

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When it refuses

A join that cannot work is refused before anything is dialled, and says which of the three reasons applies:
  • the webphone is off;
  • your extension is not registered;
  • no audio codec is enabled, so nothing could be offered.
The message appears on the room list under the room you tried.