NEC Univerge SV8100 Programming Manual page 90

Issue 10.1
Feature Cross Reference
Networking - AspireNet (OT)
2 - 54
Conditions
The keep alive message must be sent and a response not received for the retry count, for
the link to be taken out of service and the calls in progress and Park Hold orbits to be
released.
For example: If an ISDN Net Link connection is disconnected at Layer 1 then the keep
alive message can not be sent, therefore the keep alive operation will not occur.
UNIVERGE SV8100
Program 10 : System Configuration Setup