Nortel 1000 Features And Services Fundamentals page 143

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The order of precedence for activation of Second Level Call Forward No
Answer is as follows:
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Operating parameters
A maximum of two levels of Call Forward No Answer are allowed for an
unanswered call.
Calls directed to an attendant or Automatic Call Distribution (ACD) Message
Center cannot have Second Level Call Forward No Answer.
Attendant Administration cannot change the SFA/SFD Class of Service.
Error messages are generated if changes made to the Forward No Answer
or Hunt Class of Service conflict with the SFA/SFD Class of Service.
Feature interactions
Automatic Timed Reminders
When Call Forward No Answer is activated on a telephone, the slow answer
timer begins only after the call reaches its final destination.
Call Detail Recording on Redirected Incoming Calls
The Call Detail Recording on Redirected Incoming Calls feature does not
affect how these features operate; however, it does provide information
about the answering party in the CDR ID field if incoming calls have been
redirected by any one of these features.
Call Forward All Calls
Second Level Call Forward No Answer uses the final (ringing) telephone in
the chain to obtain Class of Service and forwarding DN information.
First level treatment operates in the following manner. Suppose that Party A
calls Party B, and Party B has programmed Call Forward All Calls to Party
C. Flexible Call Forward No Answer will forward a No Answer call at Party C
to the forwarding directory number associated with Party B, the dialed DN.
Copyright © 1994–2008, Nortel Networks
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Call Forward No Answer, and
Attendant Recall.
Call Forward All Calls
Second Call Forward No Answer (CFNA calls only)
Attendant Recall
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 143