Asterisk 1.8B4 and Exchange 2010

I’m working on getting the mwi light working with exchange 2010 voicemail. But i’m not clear on how to accept unsolicited mwi messages from the exchange server. Does anyone know ho to do this? Or even point me in the right direction?

There is a patch to add this feature that should work in all Asterisk 1.8 versions. Please give it a try - bug 18762: