294 Dialing plan configuration
The NRS replies with the address information for E.164 numbers. It also
provides a list of alternative SIP or H.323 endpoints, sorted by cost. If a
terminating endpoint resource is busy when a call attempt is made, the
originating endpoint tries the next alternative. If no alternative is available
over the IP network, the originating endpoint steps to the nextentr y on its
route list, which could be a TIE or PSTN alternate route.
An example of a simple off-net configuration is given in Appendix "Off-net
dialing plan configuration example" (page 405).
RoutingBranch User call to an MG 1000B PSTN
The Branch User telephone is registered at the main office. The Branch
User telephones are physically located at the Branch Office, so routing of
local PSTN calls back to the Branch Office is essential, even if theyare
registered with the main office.
Branch Office behavior of the Branch User telephones at the main office is
configured by setting Branch Office zone characteristics through LD 117 at
the main office.
Routing incoming calls from an MG 1000B PSTN to an MG 1000Btelephone (DID call)
If the DN is valid and can terminate, call termination at the Branch Office is
treated differently for IP Phones and non-IP Phones, as follows:
•IP Phones — If the telephone is registered to the MG 1000B CP PM
(Local Mode), the call is terminated locally. If the telephone is not
registered to the MG 1000B CP PM (Normal Mode), the call is routed
through a Virtual Trunk to the main office.
•Non-IP Phones — Calls are terminated locally (within the Branch Office).
If the DN is not valid, the number is considered vacant by the MG 1000B CP
PM, and VNR is used to route the call to the NRS for resolution.
SIP/H.323 zones
In a SIP/H.323 network, each NRS controls one SIP/H.323 zone. Each
zone can consist of many SIP/H.323 endpoints. If a call terminates beyond
the call originator’s own zone, the Redirect Server or H.323 Gatekeeper
of the called party’s zone provides the endpoint information to set up the
connection.
It is possible to divide a system into severalzones. It is also possible to
divide a customer within a system into different zones. It is more common to
assign one zone to one system and one customer.
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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