The document describes how to change the default behavior of the message button on the Cisco IP phone which dials into the most recently updated message box when pressed in a shared line condition.
Cisco recommends that you have knowledge of Cisco CallManager 4.x.
The information in this document is based on these software and hardware versions:
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
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The phone message button is linked to the voicemail system. Pressing the messages button causes the phone to automatically dial the voice-messaging system from a line which has a voice message. As the default behavior of the message button with shared lines, it will dial the voicemail box which has the most recent message.
While using multiple shared lines in a IP phone and trying to access the voicemail using the message button, the wrong voicemail box is accessed. This occurs when all lines have a different voicemail box. This problem is more common when the Cisco Unified IP Phone Expansion Module 7914 is used.
In order to the access voicemail of the primary line when pressing the message button, you need to choose True as the Always Use Prime Line for Voice Message parameter. By default this is False.
Complete these steps in order to change the parameter value from False to True:
Go to the Cisco Unified Communication Manager Administration page. Click Service, then select Service Parameters.
Choose the publisher from the server drop down list and choose Cisco CallManager from the service list.
Find Always Use Prime Line for Voice Message under Clusterwide Parameter (Device- Phone). Change the parameter value from False to True, then click Update.
This ensures that when you press the message button, it always dials into the prime line voice message box.