atcomsystems.ca/forum Forums Other TDM Phone Systems Sprint - Tadiran Telephones & Systems Tadiran/Shoretel Message lamp

Quite a few things to check. First I would verify the Tadiran is programmed properly for QSIG. Second, you might need to set the MWI for ATT MWI depending how the voicemail is sending the indicator. IE for regular MWI the port that sets it MUST extinguish it vs ATT MWI which can be ANY port. Tadiran pretty much wrote the book on QSIG FYI. Hope this helps.