Don't get users voicemail when called from main site

[mikeb]

I have 2 sites main CME remote UC520. both use their own cue but there is 3 digit dialing between sites which works fine. when i call a remote users ext from main site and he does not answer it does not go to his mailbox. I just get a busy. Voicemail does work with the remote office itself.

[irisrios]

From an IP Phone if you hit your message button does voicemail answer?

In CallManager express do the voicemail ports show registered?

post the following:

show version

show run

show telephony-service