Lucent Technologies Octel Unified Messenger, Planning Manual

Page: 58 / 120

Octel Unified Messenger Concepts & Planning Guide
3-10 101-1620-005
PBX integration
Callers who are forwarded to a voice server can leave a message for the
called party without additional intervention. This is made possible
through the integration of the PBX or Centrex with the Octel Unified
Messenger voice server.
With an integrated voice server, callers are greeted by the personal
greeting of the called party, inviting them to leave a message. Integration
also provides callers with the option to transfer to another extension if
they choose not to leave a message.
In an interfaced environment, in other words, without PBX integration,
calls to a subscriber’s telephone are forwarded, but no information about
the call is passed to the voice message server. The caller is requested to
reenter the mailbox or extension number of the person who is being called
in order to play the personal greeting.
Integration is accomplished when a call is forwarded to the voice server
and the telephone system passes information about the call. This
information includes calling party identification if known, called party
identification, and a forwarding reason code.
There are four ways to integrate a PBX with Octel Unified Messenger:
n
In-band signaling
n
Serial RS-232 data channel
n
Digital Meridian Integration Device (DMID)
n
Voice Bridge II
In-band signaling In-band signaling involves connecting the voice server to the PBX as if it
were a series of single-line telephones or a series of trunks in a hunt
group. The term “in-band” is used because all of the call identification
information is passed from the PBX to the voice server using DTMF
signals on the same line as the voice connection.
Series RS-232 data
channel This method of integration involves the connection of an RS-232 data link
from the PBX to the voice server. When an incoming call is sent to the
voice server, it is accompanied by a digital message from the PBX. This
messages contains the call information. Although it is sent over a separate
path from the incoming voice call, the call identification information is
linked to a particular voice port on the messaging server. This port
answers the call and plays the appropriate greeting. Data is sent to the
voice server using a standard protocol called Simplified Message Desk
Interface (SMDI) PBX-proprietary protocol.