MWI on Cisco Phones

[dhennekens 0]

I have my mailbox set to deliver VM as attachment to my email and delete the VM from the system. However, I still get an MWI sent to the phone. I dial into VM and find zero messages. Still the MWI stays. Anyway to force check that off?

[Vodia PBX 0]

Is that limited to Cisco phones? Maybe you have a very old MWI sitting there on the phone which never gets updated. In the log, try to filter SIP packets by the IP address of the phone. There should be SUBSCRIBE messages going back and forth sometimes, with message-waiting event type. If not, then you need to double check your phone configuration. Unfortunately the way SIP is specified, MWI is not included in the standard registration and you need to have an extra dialog between the PBX and the phone for that.