Trunk Anti-Tromboning; Figure 187 Call Paths With And Without Tat - Nortel BCM 3.7 Manual

536 Understanding MCDN network features

Trunk Anti-tromboning

TAT is a call-reroute feature that works to find better routes during a transfer of an active call. This
feature acts to prevent unnecessary tandeming and tromboning of trunks.
TIPS: This feature is not applicable for alerting calls.
Business Communications Manager configurations:
• Under Network Services, MCDN, set TAT to Y(yes).
The following figure shows how TAT reduces the line requirements. The solid line shows
Telephone A calling Telephone B and being transferred over an additional PRI line to Telephone
C. With TAT active, the same call is transferred to Telephone C over the same PRI line.

Figure 187 Call paths with and without TAT

Business
Communications
Manager
Telephone C
Forwarded call (no TAT)
Forwarded call (using TAT)
N0008589 3.3
Telephone A
Business
Communications
Manager
Telephone B