[pulseaudio-discuss] HSP and HFP profiles for hands-free telephony

[Georg Chini]

On 22.03.19 05:33, Mohammed Sha wrote:
>
> Hi All,
>
> 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.
>

You should consider using ofono to connect your phone to the PC. It has 
all the
telephony functions you need and it works well together with PA. See here
for a short introduction:
https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Bluetooth/


> 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
>
> |"***Bluetooth: hci0 SCO packet for unknown connection handle 0*** 
> ***Bluetooth: hci0 sending frame failed (-27)*** ***Bluetooth: hci0 
> sending frame failed (-27)***"|


This looks like an error from the bluetooth stack, probably pulseaudio
cannot correct it. I experienced problems with some Bluetooth dongles,
have you tried another one?


> The microphone on the phone is also not functioning(after bluetooth 
> connection is established). Also in |*hciconfig -a*| it is found as 
> follows
>
> |hci0:Type:PrimaryBus:USB BD Address:00:0E:8E:76:00:55ACL 
> MTU:1024:8SCO MTU:50:8UP RUNNING PSCAN RX 
> bytes:810924acl:982sco:18885events:670errors:0**TX 
> bytes:528349acl:530sco:10271commands:108errors:111**Features:0xff0xfe0x8f0xfe0xd80x3f0x5b0x87Packettype:DM1 
> DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3 Linkpolicy:RSWITCH HOLD SNIFF 
> Linkmode:SLAVE ACCEPT Name:mydevice 
> Class:0x2c041cServiceClasses:Rendering,Capturing,AudioDeviceClass:Audio/Video,PortableAudioHCI 
> Version:4.2(0x8)Revision:0x0LMP 
> Version:4.2(0x8)Subversion:0x25aManufacturer:Qualcomm|
>
> How can I solve this and implement proper hands-free telephony?
>
> The Bluetooth device is connected via USB interface, Below is the 
> device package configuration,
> pulseaudio --version
>
> pulseaudio 11.1
>  bluetoothctl --version
> bluetoothctl: 5.49
>
> ofonod --version
> 1.22
>
> The steps I followed to setup connection are as follows
>
> |$ hciconfig hci0 up $ pactl list sources short$ pactl list sinks 
> short$ bluetoothctl agent on scan on scan off pair 
> <address>connect<address> |
>
> -- 
> Thanks & Regards
> *Mohammed Sha Ebrahim*
> VVDN Technologies Pvt.Ltd
>

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