This section provides information about how the Trunk Flash feature behaves in certain circumstances. Use this information to ensure that you receive the maximum benefits of Trunk Flash under all conditions. The following considerations apply to Trunk Flash:
Caution:
Using the Trunk Flash feature, the telephone user can receive central office (CO) dial tone. A user can place a call that is not monitored by Communication Manager, and is not subject to restrictions such as toll, facilities restriction level (FRL), and class of restriction (COR). Use caution when you enable this feature.
A Trunk Flash button can be assigned on CAS attendant consoles, non-CAS attendant consoles, and multifunction telephones. For CAS attendants, use of this button is limited to certain CAS features by way of RLT trunks. For multifunction and non-CAS attendant consoles, this button is used for the Trunk Flash feature.
FAC activation of the trunk flash feature is allowed.
System features, such as internal conference call, transfer, and call par, can be combined with custom services. The custom services are CO-based features that are activated/controlled by sending a flash signal over the trunk to the CO. However, mixing Communication Manager features with custom services causes complications for the user when the user tracks a call. Communication Manager cannot give the local telephone user status information on the custom services.
The Trunk Flash feature can only be accessed if the call has only one trunk. The trunk must be an outgoing trunk and the Trunk Flash field on the Trunk Group screen must be set to y. The Trunk Flash feature is disabled when the call involves more than one trunk, even if all the trunks have Trunk Flash enabled.
The system supports five users to participate in a conference call with the trunk line party. However, to access the Trunk Flash feature, at least one of the user telephones must have a Flash button.
With a call that involves more that one user, one of the users can press the Flash button, and another user can dial the telephone number. The user that dials the telephone number is not required to have a telephone with a Flash button.
If the far-end or the central office (CO) does not support custom services, the far-end or the CO can ignore the call or drop the call. If the far-end or the CO ignores or drops the call, the user might hear a clicking sound or the user might hear silence.
