How do I enable handsfree on an M3904 on an Option61C release 24? I pick a line, dial a number, I can hear the caller but they can't hear me. I already did CLS HFA but still doesn't work....Let me know if theres anything else I need to do. Also, did a Key 16 MWK 6800 and it doesn't dial my Voice mail DN......Thanks for any help.