ES32 Lyrat Min 1.2 audio used for calls

[Digital_Millen]

We are currently utilizing the ESP32 Lyrat Min 1.2 for an audio application. Our primary objective is to establish a Bluetooth connection between the board and a mobile phone or ipad or computer(any device with Bluetooth module), then this device will initiate calls directly or through applications like WhatsApp. In this setup, the microphone from the EVKIT is intended to transmit sound, while the speaker plays the received audio from the call.

Currently, we have observed successful functionality with Google Meet calls. However, we are encountering issues with cellular and WhatsApp calls. We are curious if there might be a compatibility issue related to how the Bluetooth module handles different types of calls.

Could you provide insights or suggestions on resolving this matter? We appreciate your assistance in addressing this compatibility concern.