1072 Message Desk (SMDI)

This capability will provide the ESP with real time call status information on 
telephone calls that are terminated to a multiline hunt group.  The information
delivered in this package includes the following: MLHG and terminal 
identification of call handler, call reason (call forward type or direct call),
original calling directory number, and originally called number in the 
forwarding situation.  

The call status information is transported from the serving central office
via a data link to the ESP message desk terminal equipment.

If the ESP has a MLHG and an associated SMDI (Simplified Message Desk Interface)
data link, the ESP will get both the call status information and the ability to
activate the message waiting indicator.  Current limitations require the ESP to
obtain a MLHG and a dedicated data access link to interface with every switch in
which the ESP desires the capability to receive the call status information.

Multiple Users capability provides the delivery of calling number, called 
number, reason for forwarding of calls forwarded or placed to the ESP, 
identifies the multiline hunt group assigned to ESP customers (multiple users 
capability) and allows for the activation/deactivation of a stutter dial tone on
the ESP's customer line.  This allows the ESP to use one data link for multiple
groups of end users and the activation of message waiting indicator.  The 
reason for forwarding includes:  Call Forwarding Busy, Call Forwarding Don't 
Answer, Call Forwarding Variable (forwarding of all calls), and Direct Call.

Generic Name of ONA Service
 	Product Name						BSE or CNS
==============================================================================
Message Desk (SMDI)
	AM - Call History Package Delivery (i.e.,SMDI)		BSE 
	BA - Messaging Services Interface			BSE
	BS - SMDI						BSE 
	NX - SMDI						BSE
	PB - Forwarded Call Information				BSE 
	PB - Forwarded Call Information - Multiple Users	BSE
	PB - Forwarded Call Information - Non Centrex		BSE
	SWB - Subscriber Information Interface			 *
	USW - Message Delivery Service				BSE 

* For Southwestern Bell Telephone Company, this feature is provided as part of
  a Comparably Efficient Interconnection (CEI) service for which local 
  tariffing is planned.

FEATURE OPERATION:
There is no required action by the ESP's customer to activate the SMDI feature.
When an ESP customer's call is terminated to a MLHG served by the SMDI feature,
call information including the called DN, the type of call forwarding used for 
the call, and the calling DN (intraoffice only) is delivered by way of a 
dedicated data link to the ESP.  The ESP must then use some type of CPE to 
receive and interpret the SMDI data.  If this CPE is equipped to display the
client's account information to the attendant coincident with receipt of the 
client's call, the attendant can answer the call on a personalized basis using 
an appropriate answering phrase.

Message Desk provides the capability to initiate a request over the SMDI
link to activate/deactivate the Message Waiting Indicator (MWI) on an
individual client's line.

TECHNOLOGICAL AND FEATURE INTERACTION CONSIDERATIONS:
1. This feature is available in the following central office switches:

Switch Type			1A ESS	5ESS	DMS-100	
Earliest Generic Release	1AE8A	5E4.2*	BCS29**	

   Note: * In the 5ESS, this feature requires the non-standard pre-ISDN 
   arrangement using the ISDN 1 Message AP/ACP or 3A translator with the 
   5E4.2 Generic.
   Note: **  In the DMS-100, BCS29 supports this feature on Residential 
   Enhanced Services (RES).

2. This feature can only be offered on an Intraoffice basis.

3. The ESP's CPE used to receive and interpret the SMDI data must use the
   same signaling, control, and data communications protocol as the telephone
   office Input/Output channel.  This channel uses a standard Electronic 
   Industries Association (EIA) RS232 asynchronous 1200-baud ASCII interface.

4. Reference for SMDI:
   o TR-TSY-000283, Interface Description - Interface Between Customer Premises
     Equipment, Simplified Message Desk and Switching System: 1A ESS, Issue 1, 
     July 1985.

This service, if offered as a BSE, may be associated with the Dedicated Network
Access Link basic serving arrangement.
