Nortel Networks Remote Gateway 50 - Manual (Page 18)

Page 18 of 258 Overview
553-3001-207 Standard 2.00 January 2006
Signaling Server
The Signaling Server is required at the main office only. It provides the
following functions:
• Terminal Proxy Server (TPS)
— The TPS provides a connection from the IP Phones to the Call
Server. It also provides a connection path from a virtual trunk to the
Call Server.
• Web server for Element Manager and Network Routing Service (NRS)
Manager
A second Signaling Server can be used to provide redundancy in the case of
failure in the primary Signaling Server at the main office.
A similar function to the Signaling Server exists at the SRG.
The Signaling Server supports both en bloc and overlap signaling. En bloc
signaling is standard. If overlap signaling is to be used, Nortel recommends
that it be installed and enabled on all Signaling Servers in the network. Failure
to do so results in delays in call completion due to overlap to en bloc
conversion.
For more information about the Signaling Server, refer to Signaling Server:
Installation and Configuration (553-3001-212). For more information about
H.323 and overlap signaling, refer to IP Peer Networking: Installation and
Configuration (553-3001-213).
Network Routing Service
• 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.
Note: NRS also contains SIP Redirect Server but SIP Trunks are not
supported on an SRG.