Nortel Meridian 1 Option 11C, Administration And Maintenance

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Page 38 of 492 Chapter 2 — Feature descriptions
553-3011-311 Standard 7.0 May 1999
ISDN BRI Special Call Forward Busy
This feature is activated for a call terminated at a DSL. The call is forwarded
to the attendant when a call encounters the following busy conditions. The
calling party receives a busy tone in all other cases.
— the maximum number of calls on a DSL is exceeded, and
— an ISDN BRI DN has Call Forward busy enabled as configured in TSP
using LD27
— ISDN Hunting is not allowed or the call fails to find an idle hunt DN.
With Call Forward Busy, Special Hunting, if both B-channels are defined and
there is not a second DN, the result is Busy.
ISDN BRI Special Hunting
This feature is activated when a call terminating at a DSL encounters the
following busy conditions:
— the maximum number of calls on a DSL is exceeded, or
— the total number of calls including active, on hold, waiting, and in
progress exceeds the number of Bchannels provided for the incoming
call type.
Hunting routes the call through predetermined steps until an idle DN is found
for that call. Internal and external hunt DNs are configured in the DSL and
Hunting Allowed and Call Forward by Call type are configured in the TSP
using LD27. If Hunting is not allowed or the call fails to find an idle DN, the
following occurs.
— a busy tone is given if the number of calls exceeds the maximum calls
specified for that DSL and call forward busy does not succeed.
Note: The call is forwarded only if it is a DID call
— the call is presented as Call Waiting if the maximum number of calls for
that DSL is not exceeded.
An ISDN BRI terminal originating the call is not updated to show on its
display that the call was redirected to a different DN as a result of Hunting.
This is due to a lack of standard for layer 3 messages used to update the
terminal display.