Nortel Networks 1000S User Manual

Page of 46
 System architecture
 Page 27 of 44
Signaling Server
CS 1000S systems use a Signaling Server. The Signaling Server is an 
industry-standard, PC-based server that provides a central processor to drive 
H.323 and Session Initiation Protocol (SIP) signaling for IP Phones and 
IP Peer Networking. It provides signaling interfaces to the IP network using 
software components that operate on the VxWorks™ real-time operating 
system.
The Signaling Server has both an ELAN and TLAN network interface. The 
Signaling Server communicates with the Call Server through the ELAN 
subnet.
The Signaling Server is mounted in a 19-inch rack. The Signaling Server can 
be installed in a load-sharing redundant configuration for higher scalability 
and reliability. 
The following software components operate on the Signaling Server:
All the software elements can coexist on one Signaling Server or reside 
individually on separate Signaling Servers, depending on traffic and 
redundancy requirements for each element.
For more information about H.323 and SIP Trunking, refer to IP Peer 
Networking: Installation and Configuration
 (553-3001-213).