Nortel 1000 Features And Services Fundamentals page 121

If an incoming call has been modified by Call Forward All Calls or Hunting,
the Class of Service and forwarding DN are obtained from the dialed DN.
This applies when Call Forward No Answer specified at the customer level
is HNT or FDN.
Feature interactions
Attendant
An attendant-extended call is classified internal or external by the originating
telephone or class mark of the trunk type. This is the case whether or not
the attendant has released before forwarding occurs.
Attendant Alternative Answering
If Call Forward by Call Type is enabled on the Attendant Alternative
Answering (AAA) DN, calls are forwarded based on the Call Type of the
originator.
Attendant Break-In to Inquiry Calls
The operation of Call Forward by Call Type is overridden on a analog
(500/2500 type) telephone that has inadvertently been placed on-hook
during a Break-In conference to allow it to be re-rung by the attendant.
Automatic Timed Recall
Calls eligible for Flexible Call Forward No Answer treatment, and handled
by Call Forward by Call Type, use the Call Forward No Answer timer in
the Customer Data Block as the recall timer for attendant extended calls.
Irrespective of the relative timeout for Automatic Timed Recall, the ringing
continues as long as allowed by the Call Forward No Answer Timer.
Call Forward All Calls
If a call is unanswered at the forwarded DN, the telephone that has Call
Forward All Calls activated is checked for the Class of Service and the call
forward DN. If a chain of call forwarding occurs, the Class of Service and the
forward DN for Call Forward No Answer are obtained from the first telephone
in the chain. This applies when FDN and HNT have been specified for Call
Forward No Answer at the customer level.
Call Forward No Answer
The sequence for forwarding unanswered calls is Call Forward All Calls,
Message Waiting, Call Forward No Answer, then Attendant Recall (if the call
is attendant-extended). The same sequence is used when Call Forward by
Call Type is active for the customer.
Copyright © 1994–2008, Nortel Networks
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Nortel Communication Server 1000
Features and Services Fundamentals — Book 2 of 6 (C)
NN43001-106 02.04 Standard
Release 5.5 9 May 2008
Feature interactions 121