I have a MM3.1 (2mas/1mss) via QSIG/DS1 connections in regional hub A. In addition to this CM there are other LSP sites also hung off this hub CM. There is also another regional hub B CM that connects to hub A via QSIG/H.323 trunks. Hub B has several LSP sites as well using the MM in hub A. We are seeing issues where MWI comes on with the onset of a new msg (normal); However, within 20-30 minutes the light goes off w/o the user listening to the msg. This is happening to users hung off of hub B. OPHV shows MM sending the order to light the light (3X actually), but there is no msg from it telling it to take the light away. In the MWI DB the msg lamp shows as on, so I'm not sure why these user phones are losing the light.
Any ideas on what to try or where to look deeper at this? Also, what is the actual path the MWI takes from MM down to the user phone?