Transfer — Outgoing Trunk To Outgoing Trunk - Avaya Communication Manager Administrator's Manual

Feature Reference
Transfer — Outgoing Trunk to Outgoing Trunk
Transfer — Outgoing Trunk to Outgoing Trunk
Outgoing Trunk to Outgoing Trunk Transfer (OTTOTT) permits a controlling party (such as a station
user or attendant) to initiate two or more outgoing trunk calls and then connect the trunks. This operation
removes the controlling party from the connection and conferences the outgoing trunks. Alternatively, the
controlling party can establish a conference call with the outgoing trunks and then drop out of the
conference, leaving only the outgoing trunks on the conference.
NOTE:
This is an optional enhancement to Trunk-to-Trunk Transfer and requires careful
administration and use. The DCS Trunk Turnaround may be an acceptable and safer
alternative to this feature.
OTTOTT allows calls to be established 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 reseat the trunk board, or busy-out and release the affected trunk.
Detailed description
This feature is enabled by administering the Disconnect Supervision Out field to y on at least one
outgoing trunk group screen, and enabling Trunk-to-trunk transfer on the Feature Related System
Parameters screen. In addition, the network must provide answer supervision. The answer supervision
test increases the probability, but does not guarantee, that a disconnect signal is received from the remote
end of the trunk. To mitigate problems associated with its accidental use, this feature is administrable
only on trunk groups on the Trunk Group screen. It is not a system option.
DCS networks provide a similar but more restrictive version of this feature, called DCS Trunk
Turnaround, which permits two outgoing trunks to be connected when Communication Manager at the
remote end of one of the trunks agrees to turn around the logical direction of the trunk. DCS trunk
turnaround is permitted, when some other party involved in the call (at the remote media server or switch)
can provide disconnect supervision.
Without OTTOTT or DCS, a conference involving two or more outgoing trunks is permitted only when at
least one remaining conference party is an attendant, incoming trunk, or station.
Considerations
•
OTTOTT is not intended for use in DCS networks, since DCS Trunk Turnaround provides
comparable capabilities much more safely. However, use of OTTOTT with DCS is not prohibited,
and may be useful when one or more of the trunks goes off the DCS network.
1732 Administrator's Guide for Avaya Communication Manager
November 2003