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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

Call path with TRO

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