Fallback In Ip Trunk 3.01 (And Later) - Nortel 1000 Description, Installation And Operation Manual

Page 104 of 644
Figure 22
Example of a fallback to alternate facilities situation
Originating IPE
MMCS
IP Trunk Gateway
IP Trunk card recognizes
IP Trunk network QoS is
below acceptable
level and decides to
use other facilities to
route the call.

Fallback in IP Trunk 3.01 (and later)

553-3001-363 Standard 2.00
System description
IP Trunk network QoS falls below
Call is routed
through the PSTN
In QoS monitoring, the local node queries the remote node and gets a
response; the remote node queries the local node and gets a response. If the
remote node cannot query the local node, QoS monitoring is not available.
When an IP Trunk 3.01 (and later) node uses a Gatekeeper to resolve an
address, IP Trunk 3.01 (and later) cannot monitor QoS and provide fallback.
This function resides with the device resolving the address.
September 2004
customer-defined level
IP
Network
PSTN
Terminating IPE
MMCS
IP Trunk Gateway
553-IPT9480