This error message appears in the application event log:
Event Type: Error Event Source: Cisco CTIManager Event Category: None Event ID: 3 Date: Time: User: N/A Computer: Description: Error: kCtiLineOpenFailure - Unable to open the line CTI Connection Id: 71 Device Name: SEP00xxxxxxxxx Directory Number: Reason .: 1 App ID: Cisco CTIManager Cluster ID: Node ID: CTI Application ID: Cisco IPMA Process ID: 708 Process Name: CtiHandler Explanation: Application is unable to open the line Recommended Action: Check if the device is in the control list.
This error disappears when the Apache Tomcat service is stopped on the server.
This issue occurs when the IP Manager Assistant (IPMA) application that interacts with the computer telephony integration (CTI) Manager attempts to take control of the IP phone with the device name SEP00xxxxxxxxx, but fails.
In order to resolve this issue, upgrade the phone firmware with the latest version for which CTI Manager is unable to open the line on the particular phone. Also, delete the IPMA backup configuration entirely, and then recreate it.