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Page 766 of 1536 Chapter 3 — DPNSS1/DASS2 features description and implementation
DPNSS1 Redirection
The DPNSS1 Redirection feature allows a DPNSS1 call that is extended by
an attendant and not answered after a defined period of time, to be recalled to
an attendant. This attendant may be the attendant that originally extended the
call, or another attendant on the same or different node within the network.
553-3011-315 Standard 10.0 May 1999
Note: The DPNSS1 Redirection feature is required for DPNSS1
networks using a Centralized Operator Service, if the network nodes on
which operator consoles are located use DPNSS1 Redirection to provide
timed operator recall functionality. If operator consoles are located on a
Meridian 1 PBX, timed operator recall is provided by the DPNSS1
Timed Recall feature described in this section.
When an attendant extends a call to a destination, and the destination does not
answer before the attendant releases the call, information is passed to the
originating DPNSS1 node to initiate recall timing. If the information
indicates that the destination is free, then the slow answer recall timer is
started. If the information indicates that the destination is busy, then the
camp-on recall timer is started. For camp-on timing, if the destination party
becomes free before the camp-on timer expires, then the destination party
receives ringing. The camp-on timer is canceled, and the slow answer recall
timer is started.
If the destination answers the call extension before the recall timer expires,
the recall timer is canceled and the source and destination are connected. If
the recall timer expires before the call extension is answered, a new call is
initiated to the local attendant. If the local attendant is not available, Network
Attendant Service (NAS) routes the call to another node. If the call reaches a
state of attendant receiving buzzing, attendant receiving ringing, or queued to
attendant, then the originating party is connected to the new call and the
original call is dropped.
If a new call cannot be established, a Clear Request Message (CRM) is sent
to the originating node and the original call remains connected. If the original
call, while in call waiting or camp-on, is answered by the destination party
before the new call has attained ringing state is, a Call Connected Message
(CCM) is sent to the originating node. The new call is cleared and the original
call remains connected.