Description 135
4. The call is routed to the virtual trunk by CDP or VNR. The vir tual trunk
sends a request to the NRS for address resolution. The digit string sent
to the NRS contains the ALTPrefix. The NRS returns the IP address of
the Branch Office endpoint to the virtual trunk.
5. The virtual trunk places the call to the Branch Office.
6. The Branch Office receives the call and recognizes the first part of the
number as a Steering Code. The call is steered to an RLI. The DMI
manipulates the number into a PSTN number and the Branch Office
outpulses the digits to the CentralOffice (CO) ser vingthe Branch Office.
(This may be the same CO as the one serving the main office.) If the
alternate route has MCDN trunks in the BO2 zone, the call is outpulsed
on one of these trunks, after the Branch Office uses Digit Manipulation
(action labeled 2 in Figure 49 "Example of an alternately routed call
between a Branch Office telephone in Normal Mode and a main of"
(page 132)).
Example: Refer to Figure 50 "Illustration showing digits dialed and
outpulsed with Alternative Call Routing for NBWM" (page 134).
2225 is programmed as a Steering Code at the Branch Office. Calls
starting with this Steering Code are handled by an RLI with a PSTN
trunk route as an entry. If the Public format number for the destination
telephone is a DID number,then the Digit Manipulation Index associated
with the PSTN route must:
•delete 3 digits (remove the ALTPrefix222)
•insert 1613966 (to compose the DID number of the destination
telephone, which is 16139665262)
7. Call comes into IP Phone A from the PSTN or MCDN trunks in the main
office zone (action labeled 3 in Figure 49 "Example of an alternately
routed call between a Branch Office telephone in Normal Mode and a
main of" (page 132)).
ATTENTION
Program other Steering Codes to route calls to other locations properly (for
example, programSteer ing Code 2226 to route calls to another Branch Office
where 15063486XXX would haveto be outpulsed). Refer to the sectioncalled "A
call from a Branch Office telephone to another Branch Office telephone" (page
138).
A call from a main office telephone to a Branch Office telephone
Figure 51 "Example of an alternately routed call between a main office
telephone and a Branch Office telephone" (page 136) shows two CS 1000
systems. The system shown on the left is a main office. The system
shown on the right is a Branch Office. Both systems have access to
the PSTN. The Wide Area Network (WAN) is shownin the center with a
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright© 2007, Nor tel Networks
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