Description 167
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 Central Office (CO) serving the 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 66 "Call between a branch office telephone in
Normal Mode and a main office telephone" (page 164)).
Example: See Figure 67 "Digits dialed and outpulsed with Alternative
Call Routing for NBWM" (page 166).
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 (in order to compose the DID number of the
destination telephone, which is 16139665262)
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 have to be outpulsed). See
the section called "A call from a branch office telephone to another
branch office telephone" (page 170)
7. Call comes intoIP Phone A fromthe PSTN or MCDN tr unks in the main
office zone (action labeled 3 in ) Figure 66 "Call between a branch office
telephone in Normal Mode and a main office telephone" (page 164).
A call from a main office telephone to a branch office telephone
Figure 68 "Call between a main office telephone and a branch office
telephone" (page 168) shows an alternately routed call between 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 shown in the center with a
gatekeeper/Network Routing Service (NRS) that can be co-resident with a
Signaling Server. IP Phones are also shown associated with each system.
TelephoneA belongs to the main office. TelephoneB is a telephone at the
branch office registered to the main office. There are two bandwidth zones
indicated by the dashed line (main office zone [MO zone] and branch office
zone [BO2 zone]). Telephone A and the Media Gateway belong to the MO
zone. TelephonesB and C and the branch office belong to the BO2 zone.
Nortel Communication Server 1000
Main Office Configuration Guide forSRG 50
NN43001-307 02.02 Standard
Release 5.0 3 December 2007
Copyright© 2005-2007, Nor tel Networks
.