Lucent Technologies 8.2

DEFINITY ECS Release 8.2

Administrator’s Guide

555-233-506 Issue 1

April 2000

Features and technical reference

1136Administered Connections

■An interruption (for example, facility failure) occurs between the

endpoints.

If an AC drops because it was disabled/removed or is no longer due to be active,

no action is taken. If an AC drops because of changed A C at trib utes, an immediate

attempt is made to establish the connection with the changed attributes if it is stil l

due to be active. Existing entries in the error/alar m log are resolved if they no

longer apply. If handshake failure resulted in the dropping of the connection, in

the case of an AC involving at least one data endpoint, no action is taken for that

AC until the change administered-connection command is executed.

Administered Connections failure: Auto

Restoration and Fast Retry

When an active AC drops prematurely, you must invoke either auto restoration or

fast retry to determine whether auto restorat ion is attempted for an active AC.

If you option AC for auto restoration and the connection was routed over SDDN

trunks, auto restoration is attempted. During restoration, connections are

maintained between the switch and both endpoints. In addition to allowing the

active session to be maintained, AC also provides a high level of security by

prohibiting other connections from intervening in activ e sessions. Auto restorati on

generally completes before the 60-second endpoint holdover interval. If auto

restoration is successful, the call might be maintained (no guarantee). The

restoration is transparent to the user with the exception of a temporary disruption

of service while restoration is in progress. A successful restoration is reflected by

the restored state on the status Administered Connection screen. Although the

restoration was successful, the data session may not have been preserved.

If auto restoration is not active or if the AC is not routed over SDDN trunks, the

switch immediately attempts to reestablish the connection (fast retry). The switch

also attempts a retry if the originating endpoint initiated the drop. With fast retry,

connections are not maintained on both ends. Fast retry is not attempted for an AC

that was last established via fast retry, unless the AC is active for at least two

minutes.

If auto restoration or fast retry fails to restore or reestablish the connection, the

call drops and the AC goes into retry mode. Retry attempts continue, at the

administered retry interval, as long as the AC is due to be active.

Interactions

■Abbreviated Dialing

Use Abbreviated Dialing entries in the Destination field on the

Administered Connection screen. Entries must comply with restrictions.