Please check if the maximum number of devices that a Single CTI application user is crossing the below mentioned limits.
CTIManager provides two advanced, clusterwide service parameters that are used in conjunction with the CTI Super Provider capability:
•Maximum Devices Per Provider—This parameter specifies the maximum number of devices that a single CTI application can open. The default specifies 2000 devices.
•Maximum Devices Per Node—This parameter specifies the maximum number of devices that all CTI applications can open on any CTIManager node in the Cisco Unified Communications Manager system. The default specifies 800 devices.
Open means the line is been monitored by an Open Telephony Provider object under the remote Application. It also means the remote application placed an Observer object over the line and therefore the CTI service is sending messages to the JTAPI or TAPI middleware for the different events happening on the line, therefore recording can happen.
Usually if the Phone goes unregistered, or you logout of Extension Mobility the Line will close, because you cannot longer monitor it, and RTMT will keep it in Memory and reported as closed for some time.
Beside normal causes, you might have some abnormal causes making the lines go Close. In my experience this is caused by bad programming practices on your 3rd Party application. There are some bugs on CTI Manager as well, that might be related, CUCM 8.6 and 8.6 faced a large amount of CTI issues if you ask me.
More often than not, people will untick tick the CTI Control, efectively taking the line out of the Provider domain, or restart the CTI Manager so called "fixing" the issue, will cause customer to blame the CTI Manager service, where all responsability relies on the Controlling Application.
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