Nortel Meridian Meridian 1 Feature Description And Administration page 1117

Figure 90
Triangulation Path Replacement
Before Path Replacement Triangulation Operation
Set A
Set A calls Set B
PINX 1
QSIG
Set C
Anti-Tromboning Path Replacement
B diverted to C
QSIG
PINX 2
Set B
QSIG
PINX 3
This feature performs anti-tromboning replacements to eliminate any dual
parallel trunking that are caused by call modification. Anti-tromboning path
replacement is only invoked after the divert-to caller answer the call.
Anti-tromboning is only performed when all the trunks are associated with
the same customer.
As shown in Figure 91, Set A on PINX 1 calls Set B on PINX 2. Set B has
activated Call Forward All Calls to Set C on PINX 1. Antitromboning occurs
between PINX 1 and PINX 2 and these trunks are torn down after Set C
answers the call.
International ISDN PRI Feature description and administration
ISDN QSIG Path Replacement
After Path Replacement Triangulation Operation
Set A
PINX 1
Optimum path
Page 1117 of 1814
PINX 2
QSIG
PINX 3
Set C
Set B
553-7601