We have a corporate office that has CallManager 7.X and Unity 7.X We also have a remote site that is running CallManager 6.X and running off our Unity box. My issues are listed below
If corporate calls them via extension and they answer everything is fine. Both parties can hear each other. If it goes to voicemail it is fine. Everything works.
If remote site calls us via extension and we answer everything is fine. Both parties can hear each other. If it goes to voicemail then no audio is passed. They can hear the person's greeting but can't leave a message. Unity doesn't even recognize a voice and it hangs up the call.
The strange part is some phone work at the remote site and can leave corporate a voicemail and it comes through fine. Some phones don't work. We tried plugging the working/non working phones switch ports to see if it was port related and the problem follows the phone not the port.
I compared the phones and nothing is different at all between them as far as how the phone is programmed. I hit the i button and notice both the working phone and non working phone are using G.729 for the call. Also both the sender and receiver packets are incrementing for both the working and non working phone.
Does anyone have any insight on what to check next?