voicemail can't receive

[JK_Chang1]

In the absence of any setting change problem occurred

if intercom extension call intercom extension , no answered then forward to voicemail  and can send message .this is ok
but
if external call intercom extension , no answered then forward to voicemail "can send message but intercom user can't receive message"

what's  problem is here ? how can fix this? thanks.

cisco unified communications manager version: 10.0.1.10000-24

Cisco Unity ConnectionVersion  version: 10.0.1.10000-24

[Murali_DS]

Were you able to see the msgs on the Unity Connection and pls check if the user is able to see his VM's using his web login. What is the error msg the user is receiving when they are pressing button. Al so confirm if this affects enterprise wide agents. If this persists we would suspect an routing issue.