The "This assistant has some managers using shared lines and some using proxy lines. This mixed mode is not supported" error message appears in the IPMA configuration on Cisco CallManager

[TCC_2]

Core Issue

If the managers do not have the Shared Lines checked, it can result in the appearance of this error message in the IP Manager Assistant (IPMA):

This assistant has some managers using shared lines and some using proxy lines. This mixed mode is not supported

Resolution

In order to fix this problem, complete these steps:

1. Delete and re-add the IPMA configuration for that manager.
   
   
2. Make sure that Shared Lines is checked.
   
   
3. Restart IPMA through the Apache Tomcat client.
   
   
4. Reset the phone of that manager.

Refer to IPMA Troubleshooting Guide for more information.