[pulseaudio-discuss] HFP HF - Reject SCO Issue

Tanu Kaskinen tanuk at iki.fi
Wed May 25 16:22:48 UTC 2016

On Wed, 2016-05-25 at 09:57 -0500, Denis Kenzior wrote:
> Hi John,
> On 05/25/2016 06:01 AM, Jomon John wrote:
> > Hi,
> > 
> > I am trying to configure HFP with Bluez(5.34), Ofono(1.17) and
> > pulseaudio(6) on a Freescale i.MX6 board using Linux 4.1.15 kernel,
> > the idea is to use the target board in HFP/Handsfree Unit role. The
> > bluetooth controller is a Pluggable USB Bluetooth Dongle (0a5c:21e8
> > - BCM20702A0) with updated firmware.
> > 
> > The procedure followed is,
> > 
> > * Pair & connect with the android mobile phone with the bluetoothctl
> > * Enable modem and dial number using ofono test scripts
> > 
> > After this the call is being made but the audio routing fails with
> > "Reject SCO : Agent not registered" message from oFono. While
> > checking with btmon its found that the SCO Connect Request has been
> > rejected with the reason of limited resources(0x0d).
> > 
> > Can anyone help me to identify the root cause, I spent a lot of
> > time trying different version combinations, loading firmware and
> > checking logs but still nothing.
> This looks like a problem with PulseAudio configuration. oFono does not 
> handle SCO data, PulseAudio does that. In order to do that, PulseAudio 
> needs to register an agent with oFono. Then the SCO socket will be 
> established and the fd handed off to PulseAudio to process the audio data.
> I have no idea how this is accomplished in PulseAudio.  This question is 
> being asked fairly often recently.  Does PulseAudio have an 
> FAQ/documentation for this yet?

In /etc/pulse/default.pa, add parameter headset=ofono to module-
bluetooth-discover. That should be all that's needed at PulseAudio

Denis, would you be willing to help me with the oFono parts, if I write
a document explaining how to make bluetooth audio work with


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