Core Issue
If the Computer Telephony Integration (CTI) Route Point (RP) is not connected to any application (like any Java Telephony Application Programming Interface (JTAPI) application, Customer Response Applications (CRA) or Customer Response Solutions (CRS)), it indicates Unknown for registration. This issue can also occur if you have added the CTI route point to the hunt group. A CTI route point is not supported as a member of the hunt group. A hunt group member must have a directory number, phone or voice mail.
For more information, refer to Installation and Administration Guide, Release 1.2(1).
Also, if the CTI route point is forwarded to voice mail, it is in Unknown state, since it is not in a line that can be monitored by Telephony Call Dispatcher (TCD) to be idle or busy.
Resolution
To resolve the issue, perform this procedure:
For related information, refer to CTI Route Point Configuration.