Core Issue
Unable to access voice mail. When Messages is pressed on the phone, it does not go to the first line on the phone. It goes to the first line on an attached side car that has messages.
Resolution
In order to resolve this issue, complete these steps:
- Open the ccmadmin web page.
- Choose Service > Service Parameters.
- Choose the server in which the IP phone is registered and choose the Cisco CallManager Service.
- Locate Always Use Prime Line for Voice Message, change the value to True, and click Update.
The Always Use Prime Line for Voice Message parameter determines whether the primary line is chosen and becomes the active line when Messages is pressed. These are the valid values for this parameter:
- True the Messages button causes the phone to automatically dial the voice-message system from the primary line.
- False the Messages button causes the phone to automatically dial the voice-message system from a line that has a voice message.
This is a required field. The default value is false.
Alos you can refer the document When user presses the Messages button or when a second user calls, the calls do not automatically roll over to the next voice mail port when the first voice mail port is busy
