ANCS is not giving call status, Call duration and Disconnect for ongoing call.

Hi, Sharing the requirement and issues that we are facing with ANCS.

Requirement - On the hardware (Support BLE) along with GATT protocol, ANCS and AMC is implemented. On the display - Caller name, Duration, Status should come.

Usecase - On an incoming call hardware is getting the username/contact number and same is showing on the display, But after the call accept- no data access ANCS is providing; also once call is accepted, hardware is not able to get the call duration, caller name/number and disconnect the call.

What can be the solution here to get these information? Is there any other protocol or BLE support is needed to upgrade or any apple profile that does provide these information and control?

Thanks