We are currently experiencing issues with the MWI indicator on our SIP enabled 7942 Cisco handsets.
The phones are registering with Asterisk and we can make and receive calls however there is no attempt by the phone to send a SUBSCRIBE with a ‘message-summary’ event package.
We have tried release 8.4 and 9.3 of SIP firmware on the phone and have configured the phone using instructions from other Asterisk forums for the phones configuration.
Could someone confirm if the Cisco 7900 Series phones subscribe to voice mail in the usual way, i.e. a SIP SUBSCRIBE?
Has anyone any suggestions as to why this basic VM feature may not be working?