54System architecture
The H.323 Gatekeeper and the SIP Redirect Server can reside on the same Signaling Server. Examples of H.323 and
Note: Systems that do not support H.323 RAS procedures and H.323 Gatekeeper procedures are referred to as
Each CS 1000E in an IP Peer network must register to the NRS. The NRS software identifies the IP addresses of PBXs based on the
SIP Proxy
Communication Server (CS) 1000 Release 5.5 adds a transaction stateful SIP Proxy to the IP Peer Network.
A SIP Proxy acts as both a server and a client. A SIP Proxy receives requests, determines where to send the requests, and acting as a client on behalf of SIP endpoints, passes requests to another server.
A SIP Proxy makes the following features and functionality, which are provided by CS 1000 Release 5.5, possible:
1.Transport Layer Security (TLS).
TLS provides the NRS with private, secure signaling, message authentication, confidentiality, and integrity through
2.Mixed transport layer protocol.
A mixed transport layer protocol enables gateways using TCP, TLS over TCP, or UDP to interoperate.
3.Network features.
By default the SIP Proxy and Redirect Server functions as a SIP Proxy. However, an endpoint can request transaction by transaction that the SIP Proxy act as a SIP Redirect Server.
A SIP Redirect Server receives requests, but does not pass the requests to another server. Instead, a SIP Redirect Server sends a response back to the SIP endpoint, indicating the IP address of the called user.
4.
5.Transaction forking.
Nortel Communication Server 1000
Communication Server 1000M and Meridian 1 Large System Overview
30 September 2008
