Instruction manual

Page 1552 of 3156 Flexible Trunk to Trunk Connections
553-3001-306 Standard 10.00 January 2002
On a TBAR restricted trunk, B receives a call on incoming Trunk Route 3.
The call is established. B initiates a call with any of the Trunk Routes 1, 2, or
4.
When TBAR restricts connection from Trunk Route 3 to any other trunk
routes:
• B cannot transfer the call on Trunk Route 3 to any of the Trunk Routes
1, 2, or 4.
However, as B has Class of Service set to FTTC, the TBAR restriction is
lifted for Supervised Conference. Therefore:
• B can conference the call on Trunk Route 3 with any of the Trunk Routes
1, 2, or 4.
• Once B drops out of the conference, the two remaining TBAR trunks are
disconnected.
Since all telephones that are already present in the system default to a Class
of Service of Flexible Trunk to Trunk Connections Unrestricted (FTTU),
when the Customer Option is changed to Flexible Trunk to Trunk
Connections Trunk Barring (FTTB), TBAR restrictions for all telephones are
lifted for Conference and Transfer. Therefore, the Class of Service must be
changed to Flexible Trunk to Trunk Connections Restricted (FTTR), in order
to maintain the existing TBAR functionality. The telephone sets that are new
to the system default to a Class of Service of FTTC.
Flexible Trunk to Trunk Connections Options (FTOP) = Flexible
Trunk to Trunk Connections Only (FTLY)
When Flexible Trunk to Trunk Connections Options is set to Flexible Trunk
to Trunk Connections Only (FTLY) and the Class of Service is set to Flexible
Trunk to Trunk Connections Unrestricted (FTTU), trunk to trunk
connections are allowed for both Conference and Transfer, irrespective of
whether or not TBAR is activated.
When Flexible Trunk to Trunk Connections Options is set to Flexible Trunk
to Trunk Connections Only (FTLY) and the Class of Service is set to Flexible
Trunk to Trunk Connections Restricted (FTTR), trunk to trunk connections
are denied for both Conference and Transfer, irrespective of whether or not
TBAR is activated.