Nortel Networks NN43001-314 Network Routing Service (NRS)

MG 1000B platform hardware description 35

For more information on the Signaling Server, refer to Signaling Server

Installation and Commissioning (NN43001-312). For more information on

SIP,H.323, and overlap signaling, refer to IP Peer Networking Installation

and Commissioning (NN43001-313) .

The NCS is required to provide the Main Ofﬁce Node IP’s actual status. The

redirection procedure cannot be performed without the NCS. Interaction

with the NCS Branch Ofﬁce requires the same H.323 ID to be conﬁgured for

each Branch Ofﬁce node element (MGC). This H.323 ID exists in the NCS

(NRS H.323 Gatekeeper) Database. If there is no H.323 ID in the NCS

database, the NCS ignores the request fortranslation from the Branch user

ID (BUID) into associated Main ofﬁce node IP.For more information on the

NCS, refer to "MG 1000B Core interoperability" (page 176) and "Adding the

Branch Ofﬁce endpoints to the NRS database" (page 260).

Network Routing Service (NRS)

The NRS application provides network-based routing, combining the

following into a single application:

•H.323 Gatekeeper — provides central dialing plan management and

routing for H.323-based endpoints and gateways.

•SIP Redirect Server — provides central dialing plan management and

routing for SIP-based endpoints and gateways.

• NRS Database — stores the central dialing plan in XML format for both

the SIP Redirect Server and the H.323 Gatekeeper. The SIP Redirect

Server and the H.323 Gatekeeper accesses this common endpoint and

gateway database.

•Network Connect Server (NCS) — used only for Media Gateway

1000B (MG 1000B), SRG, Geographic Redundancy and Virtual Ofﬁce

solutions. The NCS allows the Line TPS (LTPS) to query the NRS using

the UNIStim protocol.

•NRS Manager web interface — the NRS provides its own web interface

to conﬁgure the SIP Redirect Server, the H.323 Gatekeeper, and the

NCS.

The NRS application provides routing services to both H.323 and

SIP-compliant devices. The H.323 Gatekeeper can be conﬁgured to support

H.323 routing services, while the SIP Redirect Server can be conﬁgured to

support SIP routing services. The H.323 Gatekeeper and the SIP Redirect

Server can reside on the same Signaling Server.

Each system in an IP Peer network must register to the NRS. The NRS

software identiﬁes the IP addresses of systems based on the network-wide

numbering plan. NRS registration eliminates the need for manual

conﬁguration of IP addresses and numbering plan information at everysite.

Nortel Communication Server 1000

Branch Ofﬁce Installation and Commissioning

NN43001-314 01.02 Standard

Release 5.0 20June 2007