Expert Documentation

When the SMS transparency feature is disabled, the system does not disable the sending and receiving
of SMS messages, but simply does not provide protection of SMS communications. SMS-enabled
terminals can still send and receive SMS calls, but without a guarantee that the messages will get
through.
For SMS call detection, the Alcatel-Lucent OmniPCX Office Communication Server system
must be provided with a list of the available SM-SC numbers to allow it to identify that a call is
coming from or going to an SM-SC. These numbers are provided inside a Noteworthy Address
(SMSCNum) that can be set or changed using the OMC tool; two SM-SC outgoing numbers
and two SM-SC incoming numbers can be defined.
The Alcatel-Lucent OmniPCX Office Communication Server system also performs other more
specific call management roles, described in the next section.
3.51.1.5 Call Management
The Alcatel-Lucent OmniPCX Office Communication Server system manages incoming and
outgoing SMS messages in a way that ensures operational compatibility with other features of
system. The main rules for the different features and terminal types are summarized in the
table below.
Call Waiting
Call Diversion
Simultaneous Calls
Analog Terminals
S0 ISDN Terminals
No call waiting is implemented on an incoming call for a telephone
terminal that is currently involved in an SMS call. The incoming call
follows the normal call management rules that are applied when the
telephone is busy (release, directed to attendant, etc). Since the average
SMS communication takes only 8 seconds, this has little impact
on the telephone service.
No call diversion is implemented on incoming SMS calls in order to
avoid forwarding an SMS message to a terminal that is not SMSenabled
or not owned by the intended recipient of the message. The
exception is that SMS call diversions configured locally on an S0
ISDN terminal are maintained.
More specifically:
- If call diversion is active for an SMS-enabled phone set
(immediate diversion) and the set is free, an incoming SMS call
does not follow the diversion but is delivered to the set as normal.
- If an SMS-enabled set is busy, with "diversion on busy" active, an
incoming SMS call does not follow the diversion but is handled as
described below for "Simultaneous Calls".
An analog terminal engaged in an
audio communication cannot receive
an incoming SMS message,
but it can still receive a notification
of the SMS call (if configured).
An S0 ISDN terminal engaged in
an audio communication can receive
an incoming SMS message,
since the two types of call can be
handled on separate B-channels.
For both types of terminal, an SMS call notification cannot be received
if the telephone is engaged in another SMS call. In the case of
an undelivered SMS message, once the telephone terminal has returned
to the idle state, the message can be received if the terminal
automatically calls back the SM-SC to retrieve the pending message
or if the SM-SC attempts to redeliver the message (after a delay).
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