Lucent Technologies 8.2

DEFINITY ECS Release 8.2

Administrator’s Guide

555-233-506 Issue 1

April 2000

Features and technical reference

1211Call Coverage

DEFINITY ECS provides the means of performing call classification on an

off-net coverage call to determine its disposition. If the off-net call is carried

completely over ISDN facilities to its final destination, then ISDN trunk sign aling

is used to monitor the call. Otherwise, the system uses a call classifier port.

When the DEFINITY ECS tries to classify a n off-net coverage call (CCRON)

using a call classifier port, the system introduces an unavoidable cut-through

delay while the call classifier port attempts to identify an answered call. Neither

the originating nor the answering party can hear each other dur ing t his de la y of u p

to 1 second. A call classifier is attached to all off-net coverage calls made over

analog facilities and also over ISDN facilities if the call is interworked to

non-ISDN facilities on the public network.

When the Coverage of Calls Redirected Off-Net Enabled field on the

System-Parameters Coverage-Forwarding screen i s y:

■The system monitors off-net calls (call classification) and brings them back

to the switch if they are not answered w ithin the defined time interval. (Set

this interval in the Off-Net Cvg Subsequent Redirection/CFWD No Ans

Interval field on the System-Parameters Coverage-Forwarding screen.)

Calls also return to the switch if the system detects a call progress tone,

such as busy or reorder.

■A simulated bridge appearance (SBA) is put on the principal and the green

lamp is put in flashing mode; the princ ipal can pick up the call at any time.

You have the option of dispensing with call classification (and

consequently the SBA) on a final CCRON coverage point.

■When a call classifier port is used to classify the call, th e swi tch pl ays l ocal

ringback tone to the caller while the off-net call is being classified,

concealing from the caller what is happening on the public network. When

the call is answered off-net, it is likely that the first few sylla bles spoken by

the answering party will not be heard by the calling party.

■If any party on the call is on HOLD when the call r outes off net, the call

classifier is removed from the call. The call be haves in the same manner as

off-net calls when the Coverage of Calls Redirected Off-Net field is n.

■While an off-net call is undergoing call classification, any part y who is not

already on the call will be unable to bridge onto the call. Also, the

originating party cannot release the call, conference anyone else onto the

call, or transfer the call to a new party. Once the call is answered off- ne t or

the call is returned to the switch for further cal l processing, then these

restrictions are removed.

■If the last point in a coverage path is an off-net destination and no trunks

are available to route the call, the switch atte mpts to re-t erminat e the ca ll t o

the principal.