SLT MESSAGE WAIT INDICATION Description All SLT devices will receive a “Stutter” dial tone as an audible Message Wait Indication. In addition, industry standard Message Waiting telephones may be connected to the system. Software will cause the lamp to flash when a messaging is waiting. Operation System The system switches the 90 VDC lamp On and Off for assigned SLTs indicating a Message Wait. Conditions 1. The system switches a 90 VDC supply On and Off to flash the SLT’s neon lamp. 2. Although the SLT Battery Feed is removed during the 90 VDC On cycle, the system will recognize an SLT Off-hook event. 3. The SLT must incorporate a 90 VDC neon lamp that is connected directly across the tip and ring of the voice network.