1075 Message Waiting Indicator - Activation (Audible)

This capability allows an ESP to indicate to its subscriber that a message
is waiting for retrieval.  With this capability, the ESP can activate an
audible signal, e.g., stutter dial tone, on the ESP's client's line.

Activation of message waiting can be provided in limited switch types.  The 
technology used is the same technology which supports the SMDI product.  The 
input/output (I/O) port is used to recognize incoming messages from the ESP.  
Those incoming messages direct the switch to activate a message waiting 
indication on an ESP's client's line.

Generic Name of ONA Service
 	Product Name						BSE or CNS
==============================================================================
Message Waiting Indicator - Activation (Audible)
	AM - Remote Activation of Message Waiting		BSE 
	BA - Messaging Services Interface			BSE
	BS - SMDI						BSE 
	NX - SMDI						BSE
	PB - Activate Message Waiting Indicator			BSE 
	PB - Forwarded Call Information - Multiple Users	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:
1. An ESP's client can use call forwarding busy line (CFBL), call forwarding 
   don't answer (CFDA), or call forwarding variable (CFV) to forward their calls
   to the ESP.

2. With appropriate line translations in Stored Program Control switches, an ESP
   can turn on or off a special recall dial tone (stutter dial tone) to notify
   their clients of an awaiting message.  Whenever the client attempts to
   originate a call, the client receives stutter dial tone.  This indicates to 
   the client that a message(s) has been received by the ESP for the client.  
   The client will receive stutter dial each time a call is attempted until the
   ESP sends a message to the switch to remove the stutter dialtone (MWI).  

3. Messages to turn on/turn off the Message Waiting Indicator (MWI) are sent
   to the central office on an SMDI-type data link.

4. If the client DN does not have the MWI option assigned, is not a valid DN,
   or if the switch does not have enough resources to carry out the message
   waiting function, a message is sent to the ESP via the Input/Output channel.

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. References for MWI:
   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.
