Paulo Vicentini wrote: > Hi, > I wonder if someone is facing also such issue: > sipxtapi using G711a/u decode good quality RTP audio but remote end > point decode bad voice quality > sipxtapi (hear good quality audio)<----------> Endpoint (ATA / Xlite) > (hear low quality audio) > Maybe a sipXtapi g711 encoding issue? > - Network is not the issue ( LAN) > - Windows Vista / XP > - main branch >
Hello Paulo, I have a similar problem with my systems though they are Linux based. With some sound devices the audio from sipxtapi to the remote device has a low level buzz. There is also an audible low level echo. I am still working to characterize both problems. I suspect the echo is generated inside sipxtapi. The buzz may be device sample rate related. I'm having a test system set up to vary the sample rate to find out for sure. I know for certain that some devices don't work very well at 8000 Hz sample rate - they only offer audio sampling of 8000 Hz linear 8 bit and/or rate adjust to 11025 Hz with a very poor quality sample rate conversion. The problem with using a different device sample rate to internal 8000 Hz sample rate is that - on my systems at least - there are a lot of messages about jitter buffer 'giving up' and there is a short break of audio. This is based on 11436 revision from svn _______________________________________________ sipxtapi-dev mailing list sipxtapi-dev@list.sipfoundry.org List Archive: http://list.sipfoundry.org/archive/sipxtapi-dev/
