State of knowledge
When a user accepts an incoming call on his softphone line in the ProCall Windows client, this call is still shown as missed in the smartphone call list. (not on the ProCall Mobile App, but directly on the smartphone).
Huawei smartphones create entries for GSM and ProCall Mobile calls in the smartphone's own call list, but do not mark ProCall Mobile calls as processed when the Android Connection Service is activated.
None known. This behavior has only been observed with Huawei devices so far.