Nortel Networks Remote Gateway 50 User Manual
Page 69
Bandwidth Management
Page 69 of 258
Main Office Configuration for Survivable Remote Gateway 50
Configuration Guide
Adaptive Network Bandwidth Management to these new zones as required.
Therefore, as new Call Servers are added to the network, it is not necessary
to re-provision all the other Call Servers on the network to take into account
this new Call Server. Conversely, when Call Servers are removed from the
network, the remaining Call Servers age out the old Call Server information
and therefore, provide only up to date bandwidth information.
This feature operates between all IP Peer CS 1000 systems, including the
Media Gateway 1000B and Survivable Remote Gateway 50.
Call scenario
A call is requested from a telephone in VPNI 1/Zone 2 on Call Server A to a
telephone in VPNI 3/Zone 3 on Call Server B. Both zones have Adaptive
Network Bandwidth Management enabled.
1
Call Server A contacts the Network Redirect Server to obtain the address
of Call Server B.
2
Call Server A sends a call setup message to Call Server B, identifying the
calling telephone’s VPNI and zone.
3
Call Server B determines if there is sufficient bandwidth for the call, and
sends back the VPNI and zone of the called telephone.
4
Call Server A checks its bandwidth table to determine if there is
sufficient bandwidth available for the call from Call Server A to Call
Server B.
5
If Call Server A determines there is enough bandwidth available, the call
is established; otherwise, alternate treatment is provided in the form of
blocking or rerouting the call.
Both Call Server A and Call Server B must consult their own bandwidth
tables to determine if there is enough bandwidth for the call to proceed.
Figure 10 on
shows this scenario.