Tandem Calls / Unsupervised Conference

Additional Feature Information
Tandem Calls / Unsupervised Conference

Setting up a Tandem Call

To set up a Tandem Call:

  1. Place or answer an outside call.
  2. Press CONF.
    1. Your hear Intercom dial tone.
    2. Your caller hears Music on Hold (if installed) while they wait for you to set up the Conference.
  3. Do one of the following:
    1. Place or answer an outside call.
    2. Retrieve a call from Park Orbit.
    3. Retrieve a call from Hold.
  4. Press CONF to set up the Conference.
    1. If you cannot add additional parties to your Conference, you have exceeded the system’s Conference limit.
  5. Hang up.
    1. The line/loop keys for the outside lines stay on (red).
    2. If the outside parties disconnect, the lines you selected or your extension does not have Tandem Call capability.

Disconnecting a Tandem Call

To disconnect a tandem call (using Forced Line Disconnect):

  1. Do one of the following:
    1. Press the line key for the busy line.
    2. Press INTERCOM and dial the line’s Direct Line Access code (e.g., 101 for line 1). See for Direct Line Access more.
  2. Dial # to disconnect the Tandem Call.

Barging In on a Tandem Call

To Barge In on a Tandem Call:

  1. Do one of the following:
    1. Press the line key for the busy line.
    2. Press INTERCOM and dial the line’s Direct Line Access code (e.g., 101 for line 1). See for Direct Line Access more.
  2. Push Barge In (Barg).
    1. You hear two beeps and you join the Tandem Call.

To place a Tandem Call on Hold (after Barging In):

  1. Press HOLD.
    1. The tandem callers hear Music On Hold (if installed) while they wait on Hold.
    2. While on Hold, the tandem callers cannot talk to each other.
  2. To rejoin the Tandem Call you have placed on Hold, do one of the following:
    1. Press CONF.
    2. Press one of the line keys involved in the Tandem Call.

Setting up a Line-to-Line Transfer


  • This is a type of Tandem Call in which you never have to join in with your outside callers.

To set up a Line-to-Line Transfer:

  1. Place or answer an outside call.
  2. Press TRANSFER.
  3. Place or answer another outside call.
  4. Hang up.
    1. The two outside callers join together, just line a normal Tandem Call.
    2. The line/loop keys for the outside lines stay on (red).
    3. If the outside parties disconnect, the lines you selected or your extension does not have Tandem Call capability.