The Symptoms:
After successfully pairing the N900 with a headset device, or my car's Bluetooth, I am able to initiate and receive calls, however any of the audio from the call is not transmitted to the paired device.

This used to work up until yesterday...
I have not installed nor updated any software in the past week.

The only thing I have done differently is I tried streaming music from the N900 over Bluetooth to my car's stereo system. This worked perfectly, and still works, I am able to hear that audio without problem, but I believe that since I did so, the audio from calls no longer works.

I've tried rebooting the device, but still nothing.

Any idea what could be going on or how to fix it?

Thanks

*EDIT* Of course regular calls from the N900 work without problem.

Anyone have any input at all?

Don't know much about bluetooth at all, but reading through some thread, I have a feeling the N900 is now only transmitting over A2DP, and therefore it is not transmitting the voice calls.

When I initiate a call, I notice it is transmitting something, I hear the "background noise" changing when the call initiates over my cars speakers, and I hear a slight click, but the call's audio does not go through.

Any idea how to force/change the BT protocol from A2DP to voice protocol?

hi, any progress on this?
when you pair it, you can see details and it shows which protocols are in use. check that.

no progress,
thanks for the reply.

when I pair my headset I am not sure where it shows details about the protocols.

Under "devices" it always shows the same protocols whether connected or not:
for my headset it shows HFP,HSP "device type" audio/video
for my car blutooth it shows A2DP, HFP, OPP "device type" headset

not sure how accurate that is... my last resort will be to re flash, but I'd rather figure out what's going on.

Hi, my car stereo supports A2DP, HFP, HSP, SPP and I remember a few times loosing audio, but the other side was able to hear me saying "hello?" i fixed rebooting or repairing.

i would remove/ disassociate all bluetooth devices, restart the phone, repair the headset first and see if that helps at all.

My stereo is from Volkswagen.

Excuse my ignorance, but what do you mean exactly by "repair" the headset?

I wonder the same! repair?