Avaya 555-245-600 Manual Do Utilizador

A gatekeeper is an H.323 entity on the network that provides address translation and controls 
access to the network for H.323 endpoints. For Communication Manager platforms, these are 
the Avaya S8300, S8400, S8500, and S8700-series Servers. H.323 RAS (Registration, 
Admission, and Status) Protocol messages are exchanged between the server and the IP 
endpoints for the endpoint registration. 
All H.323 voice applications (IP Softphones, IP agents, and IP Telephones) should register with 
an Avaya gatekeeper before any calls are attempted. Communication Manager sets up call 
signaling (Q.931) and call control (H.245) channels from endpoints to the gatekeeper. This 
allows Communication Manager to provide many of its calling features to H.323 calls.

The RAS protocol is used by the IP endpoint to discover and register with the Communication 
Manager gatekeeper.
When registration with the original gatekeeper (C-LAN, S8500 or S8300) IP address is 
successful, the switch sends back the IP addresses of all the C-LANs (or LSPs) in the IP 
Telephone’s network region. These addresses are used if the call signaling to the original 
C-LAN circuit pack fails. 

page 128 shows the registration process.