I have a hands free, Bury 9600 CC, and a Lumia 800.
I have the same problem with Bluetooth, Nokia Drive and getting the voice over the car speaker.
On the Bury 9600 CC I found an option to turn on/off A2DP,(see below).
When turning it off I got voice guidance from the phone speaker, and could still use the phone with hands free.
But then I couldn't use the Bury 9600 CC for controlling the Music Hub on the phone.
Turning A2DP on again, I can control the Music Hub, use hands free but no voice guidance from phone speaker or car speaker.
So here I see a part of the problem/solution.
And when we get the WP7.8 update Nokia updates Bluetooth transfer of DRM. (Again see below, the last 2 lines)
Will this update bring good or bad news for the hands free or will it not do anything at all?
Does Nokia know that it could be in the A2DP/DRM connections that the problem is?
And will Nokia solve this problem now that we know other WP-brands can use handsfree GPS/navigation?
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[h=3]Advanced Audio Distribution Profile (A2DP)[/h]This profile defines how high quality audio (
stereo or
mono) can be streamed from one device to another over a
Bluetooth connection. For example, music can be streamed from a
mobile phone, to a wireless
headset, hearing aid & cochlear implant streamer,
car audio, or from a laptop/desktop to a wireless headset.
A2DP was initially used in conjunction with an intermediate Bluetooth transceiver that connects to a standard audio output jack, encodes the incoming audio to a Bluetooth-friendly format, and sends the signal wirelessly to Bluetooth headphones that decode and play the audio. Bluetooth headphones, especially the more advanced models, often come with a microphone and support for the
Headset (HSP),
Hands-Free (HFP) and
Audio/Video Remote Control (AVRCP) profiles.
A2DP is designed to transfer a uni-directional 2-channel stereo audio stream, like music from an
MP3 player, to a headset or car radio.[SUP]
[1][/SUP]This profile relies on
AVDTP and
GAVDP. It includes mandatory support for the low-complexity
SBC codec (not to be confused with Bluetooth's voice-signal codecs such as
CVSDM), and supports optionally:
MPEG-1,
MPEG-2,
MPEG-4,
AAC, and
ATRAC, and is extensible to support manufacturer-defined
codecs, such as
apt-X. Some Bluetooth stacks enforce the
SCMS-T digital rights management (DRM) scheme. In these cases, it is impossible to connect certain A2DP headphones for high quality audio.