Browse Prior Art Database

Intelligent Network Phone Mail

IP.com Disclosure Number: IPCOM000100775D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 1 page(s) / 61K

Publishing Venue

IBM

Related People

Dillon, ME: AUTHOR [+3]

Abstract

This article describes an application for phone mail and voice messaging that will provide improved handling of "busy" and "no answer" calls on the proposed Intelligent Network.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Intelligent Network Phone Mail

       This article describes an application for phone mail and
voice messaging that will provide improved handling of "busy" and "no
answer" calls on the proposed Intelligent Network.

      Typically, in the North American telephone network, call
completion is handled outside the cluster of local area central
office switches, using the Common Channel Signaling (CCS) capability
for look-ahead routing.  The calling party dials a called party's
number which is converted by the switch into an SS datagram or
packet.  This packet traverses the telephone network to a signal
transfer point (STP), which detects certain destination and routing
information associated with the eventual call setup.  The STP
forwards the packet along to the called party's central office, and a
subscriber loop is checked for status, off-hook (busy) or on-hook
(available).  If the called party is busy, the switch senses the
condition, returns a packet via the SS7 signaling network to the
originating central office, where the packet is converted into an
instruction for the tone generation subsystem to return a busy tone
to the calling party.  All of this activity has been over the SS7
network; no voice circuit transport has been utilized until it is
determined that a call could be completed.  If the called subscriber
is not busy, the service switching point (SSP) sends a datagram
through the SS7 network to find an available route and rings the
called party.  However, the calling party has no way of knowing that
the c...