[Question] How to get the HF audio?

[anunay1]

Hi,

I want to use the solution to emulate a HFP headset. I am using a USB BT Adpater(TP-Link). I am able to simulate a set of AT commands like Answer, handup, or voice recognization,. But when I answer the call I do not get the call audio. How do I achieve call audio?

[barbibulle]

Hi. Unfortunately, the current implementation of the HFP profile only supports the signaling layer (simulating answering a call, pressing buttons, ...) but not the audio path. The A2DP profile does support audio, but sadly that's a completely different audio protocol than HFP. HFP audio is exchanged over SCO channels (not ACL), which most controllers only support via side channels (i.e not over HCI). There is a standard for sending/receiving SCO data over HCI, but we have not implemented it yet. It is on the short term roadmap though.

[anunay1]

Thanks a ton for prompt response. It will be of great help if you can also share the short term roadmap.