The Session Manager Network Connect Service (NCS) provides routing services to VoIP endpoints based on Avaya Communication Server 1000 (CS1000). This service is similar to the services provided by the Nortel Network Routing Service (NRS). The NRS provides following three services:
SIP Proxy Server (SPS): SPS performs two roles in CS1000-based configuration. These roles are SIP routing proxy and SIP registrar.
Network Connect Server (NCS): NCS supports the centralized CS1000 solution for IP clients (IP phones).
H.323 Gatekeeper (GK): GK provides typical H.323 gatekeeper functions to H.323 endpoints in the solution.
Session Manager provides both the SIP Proxy Server and Network Connect Server functionality that are provided by Nortel NRS.
Session Manager provides the following information to each UNIStim phone:
Primary signaling server
Secondary signaling server
Branch Office, Survivable Media Gateway, or Survivable Remote Gateway
The Session Manager NCS provides network redirection services for UNIStim phones for several CS1000 network features, such as geographic redundancy, virtual office, branch office, and Survivable Remote Gateway. You can define user patterns that are administered as a NRS Proxy User Rule in Session Manager and associate user patterns with up to three CS1000 Terminal Proxy Servers in priority order. Since a large number of users share the same server set, you can administer a range for the user pattern to match a large set of users.
