I have an Aria 250 with 2616 DMID attached to an OPT 81c Succ3.0. I send MWI to remotes over leased PRI voice - NO PROBLEM. I am now trying to send MWI over an IP T1 DCH. When I leave a message in a box - no light. When I MIC/MCK NO PROBLEM. What would be different between Octel using the MIC/MCK & my 2616 desk set using the MIC/MCK?? When I use DCH MSGO/MSGi the messages are identical. Cisco boxes in between. Voice & CPND travel with out issues.