
Chapter 2 System telephony networking overview 49
Networking Configuration Guide
Figure 8 Call paths with and without TRO
Trunk Anti-tromboning
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.
Figure 9 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.
Note: This feature is not applicable for alerting calls.
BCM
Meridian 1
Telephone A
Telephone B
Telephone C
Forwarded call (no TRO)
Original call (no TRO)
Meridian 1
PRI SL-1
PRI SL-1
PRI SL-1
Call path with TRO
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