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Flexible Trunk to Trunk Connections Page 1545 of 3156
Features and Services
Referring to Figure 43, Telephones A, B, and C have Class of Service set to
Flexible Trunk to Trunk Connections Unrestricted (FTTU), Flexible Trunk to
Trunk Connections Restricted (FTTR), and Flexible Trunk to Trunk
Connections Conditional (FTTC) respectively. Telephones A, B, and C and
Trunk Routes 1 and 2 are involved in a conference.
• If A is the last internal telephone to drop out of the conference, the call is
not disconnected by the Flexible Trunk to Trunk Connections feature, as
Class of Service is set to Flexible Trunk to Trunk Connections
Unrestricted (FTTU) for A. Other restrictions, however, may cause the
call to disconnect. This is an unsupervised conference. The present
functionality is maintained.
• If B is the last internal telephone to drop out of the conference, the call is
disconnected, as Class of Service is set to Flexible Trunk to Trunk
Connections Restricted (FTTR) for B.
• If C is the last internal telephone to drop out of the conference, the call is
disconnected, as Class of Service is set to Flexible Trunk to Trunk
Connections Conditional (FTTC) for C.
Functionality of Flexible Trunk to Trunk Connections with
Trunk Barring configured
Trunk Barring provides the option of denying a direct or modified connection
between Customer defined routes. Trunk Barring works with Route Access
Restriction Tables (ARTs), as defined in Overlay 56.
When the Flexible Trunk to Trunk Connections feature is used with Trunk
Barring (TBAR) configured, additional flexibility in controlling the trunk to
trunk connections for Transfer and Conference is provided.
If Flexible Trunk to Trunk Connections is implemented with the Trunk
Barring feature, the following four options are available at a customer level:
• When FTOP = FRES, Flexible Trunk to Trunk Connections Restricted,
the Flexible Trunk to Trunk Connections feature does not function. The
customer can still configure the set’s Class of Service; however, the
Class of Service does not take effect. Flexible Trunk to Trunk
Connections Restricted (FRES) is the default value.