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Thread: Call Over A2DP Bluetooth Audio

  1. Junior Droid
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    #1

    Question Call Over A2DP Bluetooth Audio

    I previously had used my droid with a wired connector into my cars audio input as a car speakerphone. It worked great. People could hear me through the droids microphone and I could hear them through the stereo.

    I bought a bluetooth stereo gateway because I wanted to be able to answer calls with my droid in the dock, navigation running in the background.

    To my dismay you cant send calls over that bluetooth profile. I say why not, I can send it over 3.5mm stereo jack.

    Is there an app or hack that allows me to do this, if not what source could I grab (its not in the dialer, its in the actual call screen) that would allow me to do this.
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  3. Master Droid
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    #2

    Re: Call Over A2DP Bluetooth Audio

    I can. I have a Kenwood car stereo with built in blue tooth support and it works fine. Maybe its a limitation of the adapter you bought?

    Sent from my Droid using Tapatalk
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  4. Junior Droid
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    #3
    I realize you may be able to with your unit because your unit probably supports both profiles. I am asking if anyone knows a way to make the calls go over stereo bluetooth just like the stereo jack. I dont see why it would be any different.
  5. Junior Droid
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    #4
    I am really amazed that this has never come up before. Really there is no app to do this?
  6. Master Droid
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    #5
    You can't do phone calls over A2DP, because A2DP doesn't support any remote control functions. The usual companion profile, AVRCP, doesn't include controls suited for telephony.

    You want to use a device which supports the HFP profile, which was designed to support telephony. Supporting asymmetrical audio paths (incoming via Bluetooth, outgoing from Droid microphone) simply isn't common - I don't know of any phones which would support that, there's just no demand for it.

    Some stereo headphones support both A2DP/AVRCP and HFP, such as the Motorola S305. These will work just fine with the Droid for both media audio and telephony.

    The limitation is not with the Droid, but with your gateway, since it apparently doesn't support any profile suitable for telephony.
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  7. Junior Droid
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    #6
    Thats just not true. Why would you not want the same option you have when hooking in a 3.5mm jack.

    I dont need a handsfree call profile. If the caller audio goes through bluetooth, you can use the droid microphone to hear your voice. Try it, it works great with a 3.5mm jack and should work fine with bluetooth stereo.

    This is a limitation of the droid, my blackberry does allow calls to go through the stereo bluetooth file. If there is no way to do it, I will consider coding this up on my own, Ill just get the PhoneApp source, change the callers voice to the media profile, and voila.
  8. Master Droid
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    #7
    Quote Originally Posted by CopyPaste View Post
    Thats just not true.
    Of course it is. Saying/wishing otherwise doesn't change that.
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  9. Droid Newbie
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    #8

    Cannot initiate/receive call over bluetooth.

    I have been struggling with getting a Bluetooth Gateway to be able to connect my Droid to my cars MP3/Aux jack as well. I can stream music to my car stereo through the BT gateway, but can NOT for the life of me get my calls to go through the car stereo.

    I've gone through 2 different BT gateways including the Blackberry BT Gateway and an HP Bluetooth Pendant, and neither works.

    The previous comment regarding BT 'profiles' enlightened me to the nuances of bluetooth. I notice when I pair to either of these BT Gateways, that on my Droid the BT profile shows as 'Media' which I'm assuming is A2DP. I don't see a profile for 'Hands Free' which would HFP, and looking at the specs I see they both only support A2DP.

    I found a few BT Receivers/Gateways on Amazon.com that appear to support HSP and HFP.
    _ Sony DRC-BT15
    _ Kensington LiquidAUX Bluetooth Car Kit (states is support voice calls, but doesn't explicitly state HSP/HFP profiles)
    _ Scosche motorMOUTH Bluetooth® Receiver

    I plan to order the Scosche motorMount since it is powered through the cig lighter (I don't want to have to replace batteries). I'll let you know how it works passing calls from my Droid to my car stereo...
  10. Master Droid
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    #9
    Moto S305's do work for calls and stereo music. So the capability is there. But bluetooth voicedial is not supported, which is lame. Dumbphones could voicedial over bluetooth years ago.
  11. Droid Newbie
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    #10
    After a little research, I just ordered the Alpine EX-10 which support A2DP, HSP, and HFP. I also found a Droid user forum where someone is using the EX-10 and getting both Music and Voice/Calls to go through the Bluetooth. It is a discontinued item from Alpine, but you can still get it through many Amazon resellers for about $35.

    My fallback was actually going to be the Kensington LiquidAux, but I don't like that the mic is built into the cigarette lighter charger which is a bit too far away in my car. I like that the Alpine EX-10 has an external mic that you can mount anywhere...
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