1074 Message Waiting Indicator (MWI) - Ability to Receive Visual Message Waiting

With this capability, the ESP's client can receive a visual alerting signal from
the ESP.  This capability is a subscriber option.  The visual MWI is a device 
with an illuminating lamp that is controlled by signals received via the 
client's line from the appropriately equipped central office switches.

Generic Name of ONA Service
 	Product Name					BSE or CNS
===========================================================================
Message Waiting Indicator (MWI)	- Ability To Receive Visual Message Waiting
	PB - Electronic Business Set Message Waiting	CNS
       	USW - Message Waiting Indication - Visual	CNS

FEATURE OPERATION:
MWI - Ability to Receive Visual Message Waiting is a central office software and
hardware capability that allows a subscriber, with special CPE, to have a lamp 
or LCD flash at 60 IPM when there are messages waiting at their message bureau,
and be turned off to indicate that there are no messages. 

This feature is activated/deactivated by the ESP who uses an SMDI-type data link
to the central office switch.  A customer's lamp or LCD is activated on their 
CPE when an ESP sends a signal to the central office to apply 130 volts to the 
customer's lamp.  The ESP (Voice Mail provider, other message provider, etc.) 
would send an additional signal after the messages have been retrieved by the 
clients to remove the 130 volts from their client's lamp.

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

Switch Type			5ESS	DMS-100
Earliest Generic Release	5E4.2*	BCS29
                        	*ISDN

2. The lamp is off when the subscriber is off-hook or there are no messages
   queued and the subscriber is on-hook. 

3. This capability requires a specialized line card.

4. References: U S WEST Reference Publication 77335 "U S WEST Message
   Waiting Indication - Visual."
