You may have registered a single subscriber with multiple lines, and are now finding that Call Parks are not working as expected, showing intermittent failures. Other services may also be impacted.
The multiple-registration limit for subscribers in Kandy Business Solutions is 10 numbers. If you go over this limit, you may experience a variety of unexpected issues; therefore, it is recommended that the number of registrations be kept below the limit at all times.
After reducing the number of multiple registrations below 10 and resetting the phones, the feature should work as expected.