[Linphone-users] no audio and bad video on Grandstream gxv3000

[LABORATORIO TEMA]

Hi all,
I have a problem with linphonec 3.4.3 on an Arm9 board with a uvc 
webcam. If I make a call to a softphone, like x-lite, I have no 
problems. The audio and the video are good, both using h263 or h263+.

But if I make a call to a Grandstream gxv3000, I have no audio and no 
video (if h263) or a very bad video (if using h263+).

Linphonec reports many messages like
.....
[h263 @ 0x56bf8]warning, clipping 2 dct coefficients to -127..127
[h263 @ 0x56bf8]warning, clipping 1 dct coefficients to -127..127
    Last message repeated 27 times
[h263 @ 0x56bf8]warning, clipping 2 dct coefficients to -127..127
[h263 @ 0x56bf8]warning, clipping 1 dct coefficients to -127..127
    Last message repeated 173 times
[h263 @ 0x56bf8]warning, clipping 2 dct coefficients to -127..127
[h263 @ 0x56bf8]warning, clipping 1 dct coefficients to -127..127
    Last message repeated 36 times
....

Thanks
Maurizio Messa