Nortel 1000 Features And Services Fundamentals page 145

DNDR time for a particular telephone, CFNA will forward this call before any
SCN/MCN keys can ring on this telephone. Note that CFNA is defined in
the number of rings and DNDR is defined in seconds.
If the Forward DN telephone is busy or invalid when the call is forwarded,
the call will return to the originally called telephone. However, the DNDR
delay timer is reapplied to the called telephone if DNDR is defined.
If a call is forwarded, as per existing operation, this call is treated as a
new incoming call to the forward DN. For example, if the forward DN has
a DNDR value defined, a new timer isgin timing according to the forward
DN's DNDR delay.
Distinctive/New Distinctive Ringing
The ringing cadence for all telephones in a chain of call redirections remains
the same as for the original DN called.
Flexible Call Forward No Answer
If Second Level Call Forward No Answer is disabled, Flexible Call Forward
No Answer operates as described.
Group Hunt
Second Level Call Forward No Answer will not be applied to calls that are
Group Hunting.
Hunting
A forwarded call may be modified by Hunting if the Call Forward No Answer
DN is busy. This call is eligible for Second Level Call Forward No Answer if
the SFA Class of Service is allowed and a Call Forward No Answer DN has
been defined for the last rung DN.
If Group Hunting is active, Second Level CFNA is not applied.
Message Centers
There are three types of Message Centers:
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Automatic Call Distribution (ACD)
Calls forwarded to an ACD Message Center are queued, so that no
CFNA timeout occurs.
Attendant
Calls forwarded to an Attendant Message Center are queued, so no
CFNA timeout occurs.
DN
An indirect call forwarded to a DN Message Center and not answered by
an operator is forwarded to a second level if SFA for DN-MC.
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 145