Nortel Meridian Meridian 1 Feature Description And Administration page 569

DPNSS1 Route Optimisation/MCDN Trunk Anti-Tromboning Interworking
Figure 54
DPNSS1/MCDN RO/TAT Interworking scenario, after RO has been applied
Station A
Station C
Node 2
Upon the completion of TAT on Node 3, a call transfer operation is
simulated, and a new RO operation is initiated to remove any potential
triangulation of routes.
Node 1
Meridi
an 1
DPNSS1
Meridi
an 1
Node 3
Note: If Station A is an attendant, TAT takes place on the MCDN side
of the gateway but RO cannot take place on the DPNSS1 side. This is a
RO limitation.
RO/TAT interworking within a DPNSS1 to MCDN gateway
The following example presents a case where RO/TAT interworking occurs
within an MCDN to DPNSS1 gateway. Here, too, we are using the case of a
call being transferred (using the DPNSS1 Three Party Service feature) across
the gateway.
International ISDN PRI Feature description and administration
Meridi
an 1
Page 569 of 1814
Station B
Meridi
an 1
Node 4
553-7648