<div dir="ltr"><div dir="ltr"><p>Hi All,</p><p> I am attempting to implement hands-free telephony on my board, I 
successfully connected my android phone to the board via bluetooth 
module in phone and media audio sharing mode.<br>
I was able to play media files via bluetooth by this. But when a call 
connected the bluetooth speaker works properly, i.e. I can hear what is 
said on the Mobile Phone, but audio is not transmitted from Board to Mobile Phone is not 
heard ( I guess there is some error in getting the data 
from mic or in transmitting data from bluetooth device). I get the 
following log message keeps appearing many times as soon as a call is 
initiated </p>

<pre class="m_-6614994200275467248gmail-default m_-6614994200275467248gmail-prettyprint m_-6614994200275467248gmail-prettyprinted"><code><span class="m_-6614994200275467248gmail-str">"***Bluetooth: hci0 SCO packet for unknown connection handle 0***

***Bluetooth: hci0 sending frame failed (-27)***

***Bluetooth: hci0 sending frame failed (-27)***"</span></code></pre>

<p>The microphone on the phone is also not functioning(after bluetooth connection is established).
Also in <code>*hciconfig -a*</code>  it is found as follows</p>

<pre class="m_-6614994200275467248gmail-default m_-6614994200275467248gmail-prettyprint m_-6614994200275467248gmail-prettyprinted"><code><span class="m_-6614994200275467248gmail-pln">hci0</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln">   </span><span class="m_-6614994200275467248gmail-typ">Type</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-typ">Primary</span><span class="m_-6614994200275467248gmail-pln">  </span><span class="m_-6614994200275467248gmail-typ">Bus</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> USB
    BD </span><span class="m_-6614994200275467248gmail-typ">Address</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">00</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">0E</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">8E</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">76</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">00</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">55</span><span class="m_-6614994200275467248gmail-pln">  ACL MTU</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">1024</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">8</span><span class="m_-6614994200275467248gmail-pln">  SCO MTU</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">50</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">8</span><span class="m_-6614994200275467248gmail-pln">
    UP RUNNING PSCAN 
    RX bytes</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">810924</span><span class="m_-6614994200275467248gmail-pln"> acl</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">982</span><span class="m_-6614994200275467248gmail-pln"> sco</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">18885</span><span class="m_-6614994200275467248gmail-pln"> events</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">670</span><span class="m_-6614994200275467248gmail-pln"> errors</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">0</span><span class="m_-6614994200275467248gmail-pln">
    </span><span class="m_-6614994200275467248gmail-pun">**</span><span class="m_-6614994200275467248gmail-pln">TX bytes</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">528349</span><span class="m_-6614994200275467248gmail-pln"> acl</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">530</span><span class="m_-6614994200275467248gmail-pln"> sco</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">10271</span><span class="m_-6614994200275467248gmail-pln"> commands</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">108</span><span class="m_-6614994200275467248gmail-pln"> errors</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-lit">111</span><span class="m_-6614994200275467248gmail-pun">**</span><span class="m_-6614994200275467248gmail-pln">
    </span><span class="m_-6614994200275467248gmail-typ">Features</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">0xff</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">0xfe</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">0x8f</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">0xfe</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">0xd8</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">0x3f</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">0x5b</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">0x87</span><span class="m_-6614994200275467248gmail-pln">
    </span><span class="m_-6614994200275467248gmail-typ">Packet</span><span class="m_-6614994200275467248gmail-pln"> type</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3 
    </span><span class="m_-6614994200275467248gmail-typ">Link</span><span class="m_-6614994200275467248gmail-pln"> policy</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> RSWITCH HOLD SNIFF 
    </span><span class="m_-6614994200275467248gmail-typ">Link</span><span class="m_-6614994200275467248gmail-pln"> mode</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> SLAVE ACCEPT 
    </span><span class="m_-6614994200275467248gmail-typ">Name</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> mydevice
    </span><span class="m_-6614994200275467248gmail-typ">Class</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">0x2c041c</span><span class="m_-6614994200275467248gmail-pln">
    </span><span class="m_-6614994200275467248gmail-typ">Service</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-typ">Classes</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-typ">Rendering</span><span class="m_-6614994200275467248gmail-pun">,</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-typ">Capturing</span><span class="m_-6614994200275467248gmail-pun">,</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-typ">Audio</span><span class="m_-6614994200275467248gmail-pln">
    </span><span class="m_-6614994200275467248gmail-typ">Device</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-typ">Class</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-typ">Audio</span><span class="m_-6614994200275467248gmail-pun">/</span><span class="m_-6614994200275467248gmail-typ">Video</span><span class="m_-6614994200275467248gmail-pun">,</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-typ">Portable</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-typ">Audio</span><span class="m_-6614994200275467248gmail-pln">
    HCI </span><span class="m_-6614994200275467248gmail-typ">Version</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">4.2</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-pun">(</span><span class="m_-6614994200275467248gmail-lit">0x8</span><span class="m_-6614994200275467248gmail-pun">)</span><span class="m_-6614994200275467248gmail-pln">  </span><span class="m_-6614994200275467248gmail-typ">Revision</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">0x0</span><span class="m_-6614994200275467248gmail-pln">
    LMP </span><span class="m_-6614994200275467248gmail-typ">Version</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">4.2</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-pun">(</span><span class="m_-6614994200275467248gmail-lit">0x8</span><span class="m_-6614994200275467248gmail-pun">)</span><span class="m_-6614994200275467248gmail-pln">  </span><span class="m_-6614994200275467248gmail-typ">Subversion</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-lit">0x25a</span><span class="m_-6614994200275467248gmail-pln">
    </span><span class="m_-6614994200275467248gmail-typ">Manufacturer</span><span class="m_-6614994200275467248gmail-pun">:</span><span class="m_-6614994200275467248gmail-pln"> </span><span class="m_-6614994200275467248gmail-typ">Qualcomm</span><span class="m_-6614994200275467248gmail-pln"> </span></code></pre>

<p>How can I solve this and implement proper hands-free telephony?</p> The Bluetooth device is connected via USB interface, Below is the device package configuration,</div><div style="margin-left:40px"><font size="1">pulseaudio --version<br></font></div><div dir="ltr"><p style="margin-left:40px"><font size="1">pulseaudio 11.1<br> bluetoothctl --version<br>bluetoothctl: 5.49<br><br>ofonod --version<br>1.22</font><br></p>

<p>The steps I followed to setup connection are as follows</p>

<pre class="m_-6614994200275467248gmail-default m_-6614994200275467248gmail-prettyprint m_-6614994200275467248gmail-prettyprinted"><code><span class="m_-6614994200275467248gmail-pln">    $ hciconfig hci0 up
    $ pactl list sources </span><span class="m_-6614994200275467248gmail-kwd">short</span><span class="m_-6614994200275467248gmail-pln">
    $ pactl list sinks </span><span class="m_-6614994200275467248gmail-kwd">short</span><span class="m_-6614994200275467248gmail-pln">
    $ bluetoothctl
    agent on
    scan on
    scan off
    pair </span><span class="m_-6614994200275467248gmail-str"><address></span><span class="m_-6614994200275467248gmail-pln">
    connect</span><span class="m_-6614994200275467248gmail-str"><address><br><br></span></code></pre><div><br>-- <br><div dir="ltr" class="m_-6614994200275467248gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><span style="background-color:rgb(243,243,243)"><span style="font-family:comic sans ms,sans-serif"><font size="2">Thanks & Regards<br><b>Mohammed Sha Ebrahim</b><br>VVDN Technologies Pvt.Ltd<br></font></span></span></div><div><span style="background-color:rgb(243,243,243)"><span style="font-family:comic sans ms,sans-serif"><font size="2"><br></font></span></span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>