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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

Core Issue

Cisco CallManager tries only for the first listed voice mail port and returns with a busy signal when a second call arrives. However, when the user manually dials the second voice mail port, it works fine.

This problem occurs when Cisco Messaging Interface is installed and running on Cisco CallManager.

Note: Cisco Messaging Interface is not required for Cisco Unity.

Resolution

To resolve this issue, disable the Cisco Messaging Interface service running on Cisco CallManager.

For more information, refer to these documents:

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