We're using CME 4.0(3) on IOS 12.4(4)XC6.
We're not able to transfer or park calls with other numbers INSIDE our dep. The transfer to outside numbers works regularly.
When we try to transfer or park calls, the active call is put on waiting (pause symbol on the phone), but then there is no way to transfer it. The fact strange is that the call is put to wait even with the park button...
Attached the partial config.
I'm quite desperate.