NEC Univerge SV9100 Manual page 674

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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.

Feature Cross Reference

Networking - AspireNet

SV9100 Networking Manual