With Outgoing Trunk to Outgoing Trunk Transfer (OTTOTT), a controlling party such as a station user or an attendant, initiates two or more outgoing trunk calls, and then connects the trunks. This operation removes the controlling party from the connection and conferences the outgoing trunks. The controlling party can also establish a conference call with the outgoing trunks, drop out of the conference, and leave only the outgoing trunks on the conference.

With OTTOTT, you can establish calls in which the only parties involved are external to Communication Manager and are on outgoing trunks. This type of call can result in locked-up trunks, such as trunks that cannot be disconnected except by busying-out and releasing the affected trunk circuit. To clear the lockup, a service technician must reset the trunk board, or busy-out and release the affected trunk.