You should verify that your phone is assigned the proper MRGL. If so, verify that your MRG that your phone is using has a hardware or software conference brigde assigned to it. If so, try resetting the conference bridge.
Sorry...just noticed you were using IP Communicator. You need to go to the preferences menu on the IP Communicator, go to the audio tab, and uncheck the "optimize for low bandwidth" box. Then reset your phone and you should be good to go. I just had this issue the other day with mine and that cleared the issue up.
I'm not able to access my old voice mail messages all of a sudden. The recording says something like 'the message is currently not available'. This has never happened before in all the years I have been using this system. I have t...