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Audio problems during (Bluetooth) phone calls PARTLY SOLVED!

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averjans

Member
Oct 9, 2007
22
7
Heythuysen
UPDATE: Title changed to PARTLY SOLVED, because some users report this procedure is not working for them.

:mad: !WARNING! :mad:
Before you enter the service menu and you go to experiment with one of these settings, keep in mind that some settings will NOT reset after a reboot or reflash and you can bring your phone in a state that it will not work as you expect.
KEEP YOUR HANDS OF THE SERVICE MENU IF YOU DO NOT KNOW WHAT YOU ARE DOING!

At least I solved my phone audio problems as described below....

Exact problem: I paired my SGS2 with a Parrot MKi9200 car kit. Music is perfect, phonebook is synced, voice dialing perfect, calling number in display, DTMF tones and other calling notifications are well.....but no audio during phone call...I could not hear anything and the caller couldn't hear me neither......:confused:

After 7 days googling, analyzing, headaches, to less sleeping hours ( :( )....I finaly found the solution this afternoon...:D

.... It is (of course) a very simple solution....but due to lack of service mode documentation I had to find out how this works exactly.

I found out that the Bluetooth audio level to my earpiece (Jabra BT500v) could easily be adjusted AND it actually stays the way I adjusted it after a power down (including removing battery).
The next step was to look for the Bluetooth audio level on my car kit. This was not the same (Bluetooth) setting :)p).

Well, a long story short.... here we go...

These are the steps I did to solve the phone call audio problem:

First of all REBOOT your phone so most (not all) values in service mode will be set to default value.

Second adjust the correct volume for a Bluetooth earpiece:

1. Go into service mode by the known code *#*#197328640#*#*
2. Select [5] AUDIO
3. Select [1] NB (VOICE CALL)
4. Select [4] BLUETOOTH
5. Select [1] Volume
6. Select [5] Sidetone: ..... (Could be any value, don't care about this value)
7. Select "MENU" - "Key input" and type 8000 and hit OK
8. Select [6] Rx Gain: ..... (Could be any value, don't care about this value)
9. Select "MENU" - "Key input" and type 0 and hit OK
10. Select [7] Tx Gain: ..... (Could be any value, don't care about this value)
11. Select "MENU" - "Key input" and type 0 and hit OK
12. Hit "MENU" and "Back" after each other until you are left out of the service mode
This will write the values into the audio chip.
I can confirm that because I tested it with reloading (and wiping) another ROM and the sound stayed exactly the same.

Third adjust the correct volume for a car kit like the Parrot MKi9200:
1. Go into service mode by the known code *#*#197328640#*#*
2. Select [5] AUDIO
3. Select [1] NB (VOICE CALL)
4. Select [4] BLUETOOTH(NREC OFF)
5. Select [1] Volume
6. Select [5] Sidetone: ..... (Could be any value, don't care about this value)
7. Select "MENU" - "Key input" and type 8000 and hit OK
8. Select [6] Rx Gain: ..... (Could be any value, don't care about this value)
9. Select "MENU" - "Key input" and type 0 and hit OK
10. Select [7] Tx Gain: ..... (Could be any value, don't care about this value)
11. Select "MENU" - "Key input" and type 0 and hit OK
12. Hit "MENU" and "Back" after each other until you are left out of the service mode
This will write the values into the audio chip.

NOTE: It is very important to go out of the servicemode by MENU and Back. This is the only way the values are written. I checked this in the log file of my SGS2. (By Android System Info app).

I can confirm the writing to the audio chip because I tested it with reloading (and wiping) another ROM and the Bluetooth audio phone volumes stayed exactly the same.

The other volume values are restored after a reboot (I checked a few of them), so that is easy.

Well, give it a try and let me and other users know the results.

UPDATE 04-09-2011:
Important notes about I2S values ("Sidetone", "RX Gain" and "TX Gain") in ALL audio menus:

- They are ONLY used for audio levels during phone calls. They will NOT change the volume when you listen to music or recording audio.
- They are ONLY saved by pressing "MENU" and "Back" until you have left the servicemode. My advice is to change them group by group, not all together.
- They are WRITTEN into the Audio Codec module. Rebooting, flashing other ROM's, wipe caches, wipe data, the secret code for factory reset WILL NOT RESET these values.

So when you messed around with these values and your audio during a phone call isn't working anymore (or the levels are too soft or too loud) you have to go into servicemode and put the values back into the Audio Codec module.

If you want to convince yourself of not resetting these values after reboot then try this:
- Set the levels ("Sidetone", "RX Gain" and "TX Gain") for the SPEAKER on 1000 (yeah, very high, gives a very loud annoying tone) as described above.
- Make a call to any number and put the speaker on..... beware of the loud noise then.
- You can try to play some music, and you will notice that the music is ok through the speaker, so this setting has no effect on playing music.
- Now switch of the phone and remove the battery
- After 5 minutes put the battery back and switch on the phone.
- make a call again and put the call on the speaker.... very loud noisy tone again.
- OOPS now you messed up your settings in servicemode....
- NO WORRY... put back value 0x35 and your speaker is working again.
(You can also try to reflash or wipe your phone, but believe me these settings do not reset to default).

UPDATE 05-09-2011:
Some notes on setting and reviewing values:
- All values set at "Sidetone", "RX Gain" and "TX Gain" settings will NOT show up again if you re-enter servicemode and check them. Actually you will see other (mostly much larger) values.
- If you made a phone call and used a specific device, for instance the speaker, and you re-enter the servicemode afterwards, the value will always show up as 0xffff.

Important: If you re-enter the servicemode and enter a specific device to check the "Sidetone", "RX Gain" and "TX Gain" settings, do not leave the servicemode by multiple 'MENU" and "Back". This will reprogram the Audio Codec with incorrect values. If you still want to look in this menu, then always enter the correct value for these 3 settings before leaving servicemode. If you leave servicemode by END or hard Back key, then nothing happens to these settings.

UPDATE 10-09-2011:
Devices: It seems that only one device can be set by the servicemode menu. The other devices will be set to some (unknown) values. (johho, Thanx for reporting this).
Echo during call: If I enter another value for sidetone (8000), then the echo is completely gone on my BT car kit and (almost) gone on the phone itself. If I enter 0 for sidetone, then there is a loud echo.
Levels: I now enter 0 for each device. This works for all devices I use (BT earpiece, BT car kit, Phone and wired earphone).

UPDATE 11-09-2011:
Sidetone and echo: sidetone is the effect of sound that is picked up by the telephone's microphone and feedback into the earpiece. If the value is to high, you will hear an echo due too the combination of the sidetone level and latency. Here you will find more interesting info about sidetone and echo: http://www.voip-info.org/wiki/view/Echo+and+Sidetone
Final solution working for me: :) I adjusted each device separately and now I got every device (wired earphone, handset, speaker, BT earpiece and BT car kit) working properly. All levels are OK and there is almost no echo anymore.
Because the BT car device resets to some defaults at which the car kit doesn't work anymore I adjust this device BLUETOOTH(NREC OFF) last.
I set 0x0 for TX and RX gain and 0x8000 for sidetone for all devices.
I adjusted the devices separately following this particular order:
[1] HANDSET
[2] HEADSET
[3] SPEAKER
[4] BLUETOOTH
[7] HANDSET(2MIC)
[6] HEADSET(3P5PI)
[5] BLUETOOTH(NREC OFF)
 
Last edited:

vyurin

Member
Sep 5, 2011
16
0
I am afraid that actually problem is more serious that we expected :(
1. I able to set those values in single audio device, but they reset to some stupid "defaults" as soon as I try to set the same item in another device. For example I have tried to set value for HEADSET(3P5PI) and then to regular HEADSET (or SPEAKER - no matter) and HEADSET(3P5PI) values reset to some defaults. With this defaults I don't hear anyone in my headphones.
2. Unable to change values for HANDSET(2MIC). No matter what I put there no changes in HANDSET calls. I able to adjust HANDSET settings (call with noise cancellation off), but as side effect #1, they will reset to defaults as soon as I put something for other devices. Looks like service menu has a bug and time to go to service :( (of course don't say anything about service menu).
BTW. this menu actually implemented as part of modem code. So it could behave differently on different modems. averjans, what modem are you using?
 

averjans

Member
Oct 9, 2007
22
7
Heythuysen
Hi vyurin,

Please look at my update on my previous post.
I'm using Lite'ning ROM PDA:XXKH3, PHONE:XXKH3, CSC:XAKH3

The modem is software is it? The hardware is the same for all SGS2's I guess?

It's a bit strange how the values are programmed by the servicemode. I think this software actually programs some registers into the Audio Codec which will retain after boot, flash and/or wipe data. I'm also quite sure that these values are read-only, because they never show up if I re-enter the settings.
 

vyurin

Member
Sep 5, 2011
16
0
Yes, I am talking about software. I also think so that we are directly programming some write-only registers (not sure now about audio chip, probably some output from modem part). But issues described in my post above make it impossible to properly program it. Do you able to confirm the same behavior during programming?

Btw, presence of background noise on high gains may indicate that output from modem is analog. I don't think that digital output could have a noise.

Btw2, In my case values will be saved as soon as I enter them, even if I leave service menu by home key, or Menu or End or Hard back key.

Could you attach headphones (one without microphone) and try to make a call? I afraid you will not hear anything, since by setting up bluetooth values, other one will reset to default. In this case making call using handset you probably can notice some background noise (noticeable in quite environment only) as well.
 
Last edited:

kcaz

Senior Member
Oct 3, 2010
96
21
That's not gone well for me. I've gone from having quiet audio to no audio over bluetooth earpiece and the bluetooth in my car.
 

averjans

Member
Oct 9, 2007
22
7
Heythuysen
kcaz, Did you exactly follow my procedure? You should always hear something. If the values are too high, then you will hear nothing because the gain is much too high.
Be sure you program each value (BLUETOOTH and BLUETOOTH(NREC OFF) separate.

Procedure in short:
- Enter servicemode
- Go to BLUETOOTH audio setting
- Enter the 3 values
- Leave servicemode by multiple MENU and Back touch keys
Then program next value (BLUETOOTH(NREC OFF)

If it still doesn't work, check the other volume settings, they shoul be default after reboot.

I tried this a lot of times with different values and it always worked for me.

I assume you have a SGS2. What type of earpiece and car kit do you use?

I hope I can help you with this. I know it is an annoying problem and it must be solved...
 
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kcaz

Senior Member
Oct 3, 2010
96
21
Got it. I had programmed BLUETOOTH but didn't touch BLUETOOTH(NREC OFF).

I just went through the same procedure but did one after the other before testing. Works fine now, and it's a little louder.
 

averjans

Member
Oct 9, 2007
22
7
Heythuysen
Ok, great!.:)
If you want it louder, just put 0x32 in BLUETOOTH(NREC OFF).
If you follow the procedure correct, you can put higher or lower values until you are satisfied. If you go too high, it wil give a loud high tone or you hear nothing.

Cheers...
 

vyurin

Member
Sep 5, 2011
16
0
Hi Averjans,

Could you please check following scenario:
1. Set some high values for Speaker.
2. Then set high values for Handset(2MIC).

Make a call using Speaker. Do you still hear those high values?

My point that:
1. I able to set values only for one of devices, rest of them get some default values.
2. Unable to set any values for HANDSET(2MIC). They just doesn't work.
 

averjans

Member
Oct 9, 2007
22
7
Heythuysen
Hi vyurin,

I did some tests and indeed the speaker values reset to something default. Even when I set values for the speaker, the Bluetooth car kit doesn't work anymore because these values are also set to some default values which are too high for my car kit.
I'm going to find out more about this, but that can take a while.

Advise: adjust only the values for the device you need to work. I noticed that the phone itself (speaker, handset) always resets to defaults which will work. So when I set my values for the Bluetooth car kit, BLUETOOTH (NREC OFF), I have all necessary devices working.

I guess the servicemode is buggy OR we don't know how it works exactly.

When a device has been used and you go into service mode, the shown values are always set to 0xffff. This will ONLY be shown the first time you start servicemode after the call and enter directly the correct device. If you select a not-used device other values will be shown and you will not find the 0xffff values anymore. You have to make another call to set the 0xffff values again for the used device.
Maybe this can help you to find the correct device you should adjust.
 

johho

Senior Member
Sep 11, 2007
292
18
Mainz
www.maklerhofmann.de
Hi vyurin,

I guess the servicemode is buggy OR we don't know how it works exactly.

.



..same here, I can only enter the values for one device..

I have problems with BT Headset AND Headphone.. With both i hear nothing.
When i enter the "32" value for bluetooth, the Headset works again!!! :), but when I enter the "32" on headsed values after this, the BT Headset doesn't work anymore.. the "normal" cable headset doesnt work too, no mater which values I enter.
So it seems that i can only "fix" BT device..
 

averjans

Member
Oct 9, 2007
22
7
Heythuysen
Can you give me the exact procedure and keys you type in. Mayb I can see some new issues that can explain why its working for me, but not for you.
Tell me also the ROM version you are using (type *#1234# in the phone dialer). I have noticed that the servicemode app has changed since the first ROMs available.
 

johho

Senior Member
Sep 11, 2007
292
18
Mainz
www.maklerhofmann.de
Can you give me the exact procedure and keys you type in. Mayb I can see some new issues that can explain why its working for me, but not for you.
Tell me also the ROM version you are using (type *#1234# in the phone dialer). I have noticed that the servicemode app has changed since the first ROMs available.

i have:
PDA I9100XXKH3
Phone: I9100XXKH3
CSC: I9100 XAKH3

Rom: Criselko V18


following procedure:

*#197328649#*

5 Audio
1 NB Voice Call
5 Bluetooth NREC off
1 Volume
5 Sidetone
menu Key input
32
6 Rx Gain
Manu key input 32
7 TX gain
menu Key input
32
menu Back
menu back
..back until SM ends.

Now BT HEadset works.

Now reentering service mode and do exactly the same as before with "Headset"..
now bluetooth Headset doesnt work anymore...(nor Headset! :()

hope this can help solve the iussue?
 

vyurin

Member
Sep 5, 2011
16
0
Btw, Service menu is the part of modem.bin. ServiceModeApp is just front-end. I just flashed KE4 modem and service menu a tittle bit different. But problem with programming Audio still exist. And seems to me it store this information in some NV memory, not in audio chipset. According to audio chipset datasheet I think it doesn't know anything about different type of in/out.
 

averjans

Member
Oct 9, 2007
22
7
Heythuysen
vyurin, Thanks for this info. Can you send me the datasheet of the audio chip? I couldn't find on the internet. I assume it is the YMU823 from Yamaha?
Do you know if the source of the modem part is also open souce? I was looking for this and can't find it. Thanks in advance.
 

vyurin

Member
Sep 5, 2011
16
0
download.yamaha.com/file/46319

Unfortunately there are no information about registers available.
About modem sources - no luck to find them. Probably it is simplest way to solve the issue.

About I2S(0,1,2) - it signal bus for Audio/Video devices for inter-exchange (as I read). Our processor has 3 of them.
 
Last edited:

johho

Senior Member
Sep 11, 2007
292
18
Mainz
www.maklerhofmann.de
i'm really really sad about this.. tryed to change volume on BT, Headset and Speaker, now my device is totally scrumbled.. I geto only one of the things working again by entering 32 as key value, the others doesnt work until i enter the same there, but than the other one which worked bevore stops working.. :( :( :(

There muste be another way to reenter the correct values, specially while only this three settings (Gain) seems to make such problems. The other (dezimal) values are saved and stored correctly no matter what i enter as value.

I hope i'll get this working again, because atm my GS2 isn't really good to use without any comfort of headset or Bluetooth Headset :(

There must be any way to reset the entered values.. on GS1 it seems to work because this device has a reset switch in Service Menu :(

EDIT: newest crop after flashing diffrent Modems to test if this makes some diffrence: i hear a kind of echo even while using just the phone to phone.. So i hear my own voice a few ms after i spoke.. :( :( :( (Modem KH3)
i'd better never changed a thing in that damm buggy service mode..
 
Last edited:

vyurin

Member
Sep 5, 2011
16
0
johho, I heard echo after attempt to put something into sidetone field. Echo gone after reboot.
 

johho

Senior Member
Sep 11, 2007
292
18
Mainz
www.maklerhofmann.de
..ok i tested a lot the last hours..

its definitively that i can only change one device.

If I change the values on Bluetooth, the Speakerphone doesnt work anymore but bluetooth does. Even after reboot, reflashing etc.
If i now change Speakerphone, this works but bluetooth doesnt anymore.
Same with Headphone.

No matter what procedure I try this it the fact on my device.. Don't know why.. :( :( :(

So it seems that my Audio Settings are totally scrumbled and im not able to set it back to working values for all connected devices..

BTW whats the diffrence between a) bluetooth and b) bluetooth (NREC OFF) and between c) headset and d) headset(3P5PI) ?

I found out that my BT Headset only works with changing the Values on Bluetooth(NREC OFF)
 

vyurin

Member
Sep 5, 2011
16
0
johho,
what I know is that headset applies to headset with microphone, headset(3P5PI) without microphone.

I experience the same problems - able to set only one device.
 

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  • 4
    UPDATE: Title changed to PARTLY SOLVED, because some users report this procedure is not working for them.

    :mad: !WARNING! :mad:
    Before you enter the service menu and you go to experiment with one of these settings, keep in mind that some settings will NOT reset after a reboot or reflash and you can bring your phone in a state that it will not work as you expect.
    KEEP YOUR HANDS OF THE SERVICE MENU IF YOU DO NOT KNOW WHAT YOU ARE DOING!

    At least I solved my phone audio problems as described below....

    Exact problem: I paired my SGS2 with a Parrot MKi9200 car kit. Music is perfect, phonebook is synced, voice dialing perfect, calling number in display, DTMF tones and other calling notifications are well.....but no audio during phone call...I could not hear anything and the caller couldn't hear me neither......:confused:

    After 7 days googling, analyzing, headaches, to less sleeping hours ( :( )....I finaly found the solution this afternoon...:D

    .... It is (of course) a very simple solution....but due to lack of service mode documentation I had to find out how this works exactly.

    I found out that the Bluetooth audio level to my earpiece (Jabra BT500v) could easily be adjusted AND it actually stays the way I adjusted it after a power down (including removing battery).
    The next step was to look for the Bluetooth audio level on my car kit. This was not the same (Bluetooth) setting :)p).

    Well, a long story short.... here we go...

    These are the steps I did to solve the phone call audio problem:

    First of all REBOOT your phone so most (not all) values in service mode will be set to default value.

    Second adjust the correct volume for a Bluetooth earpiece:

    1. Go into service mode by the known code *#*#197328640#*#*
    2. Select [5] AUDIO
    3. Select [1] NB (VOICE CALL)
    4. Select [4] BLUETOOTH
    5. Select [1] Volume
    6. Select [5] Sidetone: ..... (Could be any value, don't care about this value)
    7. Select "MENU" - "Key input" and type 8000 and hit OK
    8. Select [6] Rx Gain: ..... (Could be any value, don't care about this value)
    9. Select "MENU" - "Key input" and type 0 and hit OK
    10. Select [7] Tx Gain: ..... (Could be any value, don't care about this value)
    11. Select "MENU" - "Key input" and type 0 and hit OK
    12. Hit "MENU" and "Back" after each other until you are left out of the service mode
    This will write the values into the audio chip.
    I can confirm that because I tested it with reloading (and wiping) another ROM and the sound stayed exactly the same.

    Third adjust the correct volume for a car kit like the Parrot MKi9200:
    1. Go into service mode by the known code *#*#197328640#*#*
    2. Select [5] AUDIO
    3. Select [1] NB (VOICE CALL)
    4. Select [4] BLUETOOTH(NREC OFF)
    5. Select [1] Volume
    6. Select [5] Sidetone: ..... (Could be any value, don't care about this value)
    7. Select "MENU" - "Key input" and type 8000 and hit OK
    8. Select [6] Rx Gain: ..... (Could be any value, don't care about this value)
    9. Select "MENU" - "Key input" and type 0 and hit OK
    10. Select [7] Tx Gain: ..... (Could be any value, don't care about this value)
    11. Select "MENU" - "Key input" and type 0 and hit OK
    12. Hit "MENU" and "Back" after each other until you are left out of the service mode
    This will write the values into the audio chip.

    NOTE: It is very important to go out of the servicemode by MENU and Back. This is the only way the values are written. I checked this in the log file of my SGS2. (By Android System Info app).

    I can confirm the writing to the audio chip because I tested it with reloading (and wiping) another ROM and the Bluetooth audio phone volumes stayed exactly the same.

    The other volume values are restored after a reboot (I checked a few of them), so that is easy.

    Well, give it a try and let me and other users know the results.

    UPDATE 04-09-2011:
    Important notes about I2S values ("Sidetone", "RX Gain" and "TX Gain") in ALL audio menus:

    - They are ONLY used for audio levels during phone calls. They will NOT change the volume when you listen to music or recording audio.
    - They are ONLY saved by pressing "MENU" and "Back" until you have left the servicemode. My advice is to change them group by group, not all together.
    - They are WRITTEN into the Audio Codec module. Rebooting, flashing other ROM's, wipe caches, wipe data, the secret code for factory reset WILL NOT RESET these values.

    So when you messed around with these values and your audio during a phone call isn't working anymore (or the levels are too soft or too loud) you have to go into servicemode and put the values back into the Audio Codec module.

    If you want to convince yourself of not resetting these values after reboot then try this:
    - Set the levels ("Sidetone", "RX Gain" and "TX Gain") for the SPEAKER on 1000 (yeah, very high, gives a very loud annoying tone) as described above.
    - Make a call to any number and put the speaker on..... beware of the loud noise then.
    - You can try to play some music, and you will notice that the music is ok through the speaker, so this setting has no effect on playing music.
    - Now switch of the phone and remove the battery
    - After 5 minutes put the battery back and switch on the phone.
    - make a call again and put the call on the speaker.... very loud noisy tone again.
    - OOPS now you messed up your settings in servicemode....
    - NO WORRY... put back value 0x35 and your speaker is working again.
    (You can also try to reflash or wipe your phone, but believe me these settings do not reset to default).

    UPDATE 05-09-2011:
    Some notes on setting and reviewing values:
    - All values set at "Sidetone", "RX Gain" and "TX Gain" settings will NOT show up again if you re-enter servicemode and check them. Actually you will see other (mostly much larger) values.
    - If you made a phone call and used a specific device, for instance the speaker, and you re-enter the servicemode afterwards, the value will always show up as 0xffff.

    Important: If you re-enter the servicemode and enter a specific device to check the "Sidetone", "RX Gain" and "TX Gain" settings, do not leave the servicemode by multiple 'MENU" and "Back". This will reprogram the Audio Codec with incorrect values. If you still want to look in this menu, then always enter the correct value for these 3 settings before leaving servicemode. If you leave servicemode by END or hard Back key, then nothing happens to these settings.

    UPDATE 10-09-2011:
    Devices: It seems that only one device can be set by the servicemode menu. The other devices will be set to some (unknown) values. (johho, Thanx for reporting this).
    Echo during call: If I enter another value for sidetone (8000), then the echo is completely gone on my BT car kit and (almost) gone on the phone itself. If I enter 0 for sidetone, then there is a loud echo.
    Levels: I now enter 0 for each device. This works for all devices I use (BT earpiece, BT car kit, Phone and wired earphone).

    UPDATE 11-09-2011:
    Sidetone and echo: sidetone is the effect of sound that is picked up by the telephone's microphone and feedback into the earpiece. If the value is to high, you will hear an echo due too the combination of the sidetone level and latency. Here you will find more interesting info about sidetone and echo: http://www.voip-info.org/wiki/view/Echo+and+Sidetone
    Final solution working for me: :) I adjusted each device separately and now I got every device (wired earphone, handset, speaker, BT earpiece and BT car kit) working properly. All levels are OK and there is almost no echo anymore.
    Because the BT car device resets to some defaults at which the car kit doesn't work anymore I adjust this device BLUETOOTH(NREC OFF) last.
    I set 0x0 for TX and RX gain and 0x8000 for sidetone for all devices.
    I adjusted the devices separately following this particular order:
    [1] HANDSET
    [2] HEADSET
    [3] SPEAKER
    [4] BLUETOOTH
    [7] HANDSET(2MIC)
    [6] HEADSET(3P5PI)
    [5] BLUETOOTH(NREC OFF)
    1
    kcaz, Did you exactly follow my procedure? You should always hear something. If the values are too high, then you will hear nothing because the gain is much too high.
    Be sure you program each value (BLUETOOTH and BLUETOOTH(NREC OFF) separate.

    Procedure in short:
    - Enter servicemode
    - Go to BLUETOOTH audio setting
    - Enter the 3 values
    - Leave servicemode by multiple MENU and Back touch keys
    Then program next value (BLUETOOTH(NREC OFF)

    If it still doesn't work, check the other volume settings, they shoul be default after reboot.

    I tried this a lot of times with different values and it always worked for me.

    I assume you have a SGS2. What type of earpiece and car kit do you use?

    I hope I can help you with this. I know it is an annoying problem and it must be solved...
    1
    Elvispen,

    I've got this echo too and now I solved it, no echo any more. See my update at my first post.
    I keep all items I found out about this issue in the first post so you don't have to search al posts.
    1
    I wonder if there's any option in Service mode to route calls through the line out when the phone is in the official car dock or desktop dock. Right now when in either it defaults to the phone's loudspeaker while all other sounds (media, notification, key presses) go properly through the lineout
    1
    Elvispen, I have indeed all devices working at the same time (I just tested them all). Even the echo is almost gone on all devices. On my car kit I have no echo at all.
    I think the TX and RX gain levels are represented in db and 0 is a default level.
    I also tried 0x7fff for sidetone value and then there is echo. At 0x8000 the echo is gone or set to a minimum.
    Sidetone is the effect of sound that is picked up by the telephone's mouthpiece and introduced into the earpiece of the same handset, acting as feedback.

    I will update my first post with the last result so everyone with this issue can try if this solves the problem.