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The CWC group is allowed many features, here is a list of them.
1. Call Forwarding Variable: Users can forward their calls to remote stations
located in another office by dialing the access code and the intercom
number of the CWC station.
2. Call Forwarding Busy Line: Provides for the forwarding of calls to any
interlocation station within the CWC group upon encountering a busy station.
3. Call Forwarding Don't Answer: Provides for the forwarding of calls that are
not answered within a predetermined number of ringing cycles.
4. Call Transfer: Allows the station user to transfer any established call to
any other station within the CWC group with the following constraints.
o Dropback rules do not permit 2 outgoing trunks to be involved in the
final 2 party connection. However, 2 outgoing trunks can be involved in
a 3 way conversation.
o On interoffice calls involving a fully restricted station, flash
capability is allowed. However, the controller is not permitted to
connect the fully-restricted station to any other station, either in
dropback or a 3 way conversation.
Cross network call transfer transparency requires that each location be
provided the Call Transfer-Individual or Call Transfer-Individual-All calls
feature. The CTO (call transfer outside) option may be provided.
5. Call Waiting feature provides a burst of tone when the called party is busy
on another call. The types of Call Waiting features and CWC interactions are:
o Call Waiting Originating: allows a CWC calling station to direct a call
waiting tone toward a busy station within the same CWC group.
o Call Waiting Intragroup: gives call waiting tone to a called party
which has call waiting terminating on all intragroup calls.
o Dial Call Waiting: Allows originating CWC station users to invoke call
waiting on CWC intragroup calls by dialing an access code followed by
the extension number of the station to be call waited.
6. Distinctive Ringing/CW Tone: Allows a CWC station user to determine the
source of a call incoming to the station. This is done by associating a
distinctive ringing or tone pattern with the incoming call based on its source.
Interlocation CWC calls receive intragroup treatment.
7. Message Desk Service: Provides centralized and personalized call coverage or
message answering capabilities which can serve the needs of all CWC locations.
The Call Forwarding Variable and Call Forwarding Busy Line/Don't Answer feature
are needed of forwarding calls from stations within the CWC group.
8. LASS (Local Area Signalling Service): Provides the called party with call
management and security services. Local CCIS is required for multiple-office
grouping within a LATA for intercom calls. The following features comprise the
LASS offering :
o Automatic Recall: Enables a station user to place a call to the LCDN
(Last Call Directory Number) currently associated with the users fone.
The LCDN can either be the last party called by the station user or the
last party to call the station user.
o Distinctive Alerting: Allows the station user to prespecify a set of
numbers which activate a distinctive ring or distinctive call waiting
tone. The CWC extension numbers can be entered on the screen list. When
the user receives a call from one of these numbers, the phone if idle,
will ring with a special distinctive ringing pattern. If a call waiting
customer's line is busy, a special tone notifies the customer of the
impending call.
o ICLID: provides the number which is calling the station user. (Explained
in other files)
o Selective Call Forwarding: (Explained in other file)
o Selective Call Rejection: Provides the user with the capability of not
being alerted by calls from a specified set of numbers. The user inputs
the numbers to be rejected from the station set. These numbers are
specified either directly (dialed in) or as the number of the last call
received. The CWC extensions are allowed on the screen list.
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=(C) 1986 The Executioner and The Egyptian Lover and PLP =
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This file is based on the AT&T document for the CWC.
==Phrack Inc.==
Volume One, Issue Eight, Phile #4 of 9
The Integrated Services Digital Network
---==> By Dr. Doom <==---
ISDN or Integrated Services Digital Network has been talked about off and on
by AT&T and until now has just been a demented AT&T fantasy, but it is to soon
become a reality. This phile is the second I have written on the subject and
is a cumulation of information from three basic sources :
<1> The ISDN AT&T Technical Journal