Just an update--- Decided to upgrade to Ubuntu 11.10 and had more success.  
Finally got A2DP audio to pump successfully with the module-loopback enabled 
(using bluez 4.96, pulseaudio 1:1.0-0, gnome-bluetooth 3.2.0) !

However, the HFP mode (i.e. Audio Gateway) still produces no call audio for me 
:(  Played with the PA Sound Profiles a bit (through the standard Ubuntu 
sound-indicator GUI), noticing a "Handsfree Gateway" profile for my Phone's 
sound device.  Choosing this opens an audio stream (I can hear a slight hiss), 
but still can't hear audio coming from the other end of the phone line.  My 
/etc/bluetooth/audio.conf file is set to "Enable=Source,Sink,Gateway,Control".


________________________________
From: Scott Haynie <[email protected]>
To: Gustavo Padovan <[email protected]>; "[email protected]" 
<[email protected]>
Sent: Monday, October 24, 2011 11:03 AM
Subject: Re: No audio with HFP


Tried those steps on that wiki and on the video.  Still no audio coming through 
the speakers.  No audio on the phone either, which means it's probably making 
its way to the PC, but not to the sound card.
I've attached logs from bluetoothd, ofonod, and pulseaudio from 
pairing/connecting with my phone, making a call, and enabling the 
module-loopback.
Any help is much appreciated!
Thanks,
Scott


________________________________
From: Gustavo Padovan <[email protected]>
To: Scott Haynie <[email protected]>; [email protected]
Sent: Wednesday, September 21, 2011 2:43 PM
Subject: Re: No audio with HFP

Hi Scott,

* Scott Haynie <[email protected]> [2011-09-21 14:19:46 -0700]:

> Trying to get ofono HFP to work on my Ubuntu 11.04 box.  I can 
> connect to the bluetooth device and initiate a voice call, but I can't 
> hear any audio coming from the speakers.
> Went through
 the 
> instructions here: http://ofono.org/wiki/hands-free-profile . Saw 
> something related to configuring pulse audio, but no pointers as to how 
> to do that-- I do have the pulse audio package installed.

Have a check at
http://padovan.org/blog/2010/02/handsfree-profile-into-bluez-and-ofono/

The audio is handled by pulseaudio, and you need to enable loopback between
the Bluetooth stream and your mic and speaker.

    Gustavo



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