I am trying to do a similar thing, but I would prefer to use message waiting voltage for the strobe so that it flashes until the message is picked up.
Traditionally, message waiting is similar to analog ring voltage, ~90VAC at 20Hz, except it is only half of the wave form. This makes a pulsating DC signal at 20Hz. I don't think that that Avaya's message waiting signal is the same as above.
There are strobes designed to flash on ring voltage that will also work with message waiting voltage, but I can't get our G3r 8.5 to do it. Does anyone know if there are parameters you can set to duplicate the normal, pulsating DC message signal?
TIA