If your voicemail service is working, but you are not getting an interrupted dialtone when new messages are present, there may be a configuration problem on our end.
1. Verify that your voicemail is working by leaving a message for yourself then checking for the presence of the message.
2. Even if no interrupted dialtone is present, ensure that you can retrieve the message, listen to it, and delete it.
3. Contact technical support for further assistance in this regard.