Nortel Networks NN43001-314 - Manual (Page 181)

Branch Office dialing plan 181
The maximum bandwidth required for these activities is approximately 13
Kbps. This is insignificant when compared to the bandwidth requirement
for the expected voice traffic.
Therefore, when determining the LAN/WAN bandwidth requirement for a
Branch Office, expected voice traffic should be the major factor.
Branch Office dialing plan
Since IP Phone users can be located at a Branch Office equipped with
an MG 1000B Core, the routing of calls to the local gateway is important
(especially when toll charges apply to calls made from the central Call
Server that controls the telephone). The administrator can configure digit
manipulation through zone attributes for IP Phones to select a main office or
Branch Office that provides PSTN access local to the destination of the call.
The Branch Office feature supports the various PSTN interfaces. Refer
to Electronic Switched Network: Signaling and Transmission Guidelines
(NN43001-280) for further information.
Calls from the PSTN to users within the network can be routed with the
various ESN numbering plan configurations or the Vacant Number Routing
(VNR) feature. This enables small sites, such as a Branch Office, to require
minimal configuration to route calls through other Call Servers or through
the NRS.
Outgoing calls can include local and, optionally, long-distance calls.
To access local PSTN resources, outgoing calls can be routed using ESN
as well as zone parameters that enable digit insertion. The zone parameters
force calls made by a Branch User to be routed to the desired local PSTN
facilities.
For more information about PSTN configuration, see "Configuration example
for PSTN resources at the Branch Office" (page 183) .
Nortel recommends that the Branch User ID (BUID) be the same at the
Branch Office as the DN at the main office. A BUID has a maximum of 15
digits. Under the recommended Coordinated Dialing Plan (CDP), it can be
an extension (for example, 4567). Under the Uniform Dialing Plan (UDP),
it is the user’s main office DN, the Location Code (LOC), plus the Access
Code (for example, 6 343-5555).
The main office DN must be an ESN-compliant DN. See "ESN Access
Codes" (page 182) .
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright © 2007, Nortel Networks
.