Technical information

Security Measures
Issue 7 June 2001
4-43
Disable Transfer Outgoing Trunk to
Outgoing Trunk
The outgoing trunk to outgoing trunk transfer (OTTOTT) (G3r and G3V2 and later)
feature allows a controlling party, such as a station user or attendant, to initiate
two or more outgoing trunk calls and then transfer the trunks together. The
transfer 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 connection.
Since OTTOTT allows calls to be established in which the only parties involved
are external to the switch and are on outgoing trunks, it is a perilous enhancement
of trunk-to-trunk transfer. To mitigate problems associated with its accidental use,
this feature is only administrable on trunk groups on the trunk group form and is
enabled using the Disconnect Supervision Out field. This feature is not a
system-wide option.
Also, OTTOTT is not intended for use in Distributed Communication System
(DCS) networks, since DCS Trunk Turnaround provides comparable capabilities
in a much safer way. However, use of OTTOTT with DCS is not prohibited, and
may be helpful when one or more of the trunks go off the DCS network.
!
CAUTION:
This feature can be used to transfer an outside party to a trunk over which
toll calls might be made.
To minimize the risk of toll fraud with this feature, follow these steps:
 Since trunks have to be specifically administered for OTTOTT, examine the
COR and FRL of the trunk group to determine if they are appropriate.
 If the feature is not relevant to your business, do not enable it. If a
temporary need for the feature arises, enable it and then turn it off.