Nortel Networks 1000S - Manual (Page 43)

Configuration options Page 43 of 44
Communication Server 1000S Overview
Figure 7
Network failure with survivable MG 1000S systems
IP telephony node configuration
An IP telephony node is a grouping of Voice Gateway Media Cards (and
Signaling Servers), regardless of the location of the Voice Gateway Media
Cards in the MG 1000S. Therefore, several MG 1000S can belong to the
same node. Alternately, each MG 1000S can have its own node.
Each IP telephony node can be configured with the IP address of an Alternate
Call Server, to which it registers if the Call Server is unavailable.
Note: The Alternate Call Server is an MG 1000S SSC that is configured
as survivable.
553-AAA2134
1. Call Server Database periodically
synchronized at Media Gateways
2. IP Campus Network Fails
3. Distributed Media Gateway enters
Survival mode
4. Voice Gateway Media Card registers
at Survival Media Gateway Controller Card
5. Operation resumes at Survivable site using
local cards only
6. Primary Call Server continues in normal mode for
reachable Media Gateways
Call Server
Signaling Server (optionally redundant)
-Terminal Proxy Service (TPS)
-H.323 Gateway Signaling S/W
WAN
Survivable
Media Gateway
1000S
PSTN
Media Gateway
1000B