In an environment with old LAN cabling, chances are so high that call get interrupted, words drop every now and then, and at the worst case, the sound quality gets terribly unbearable. This is mainly caused by the issue commonly referred to as Jitter.
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Daily Archives: September 19, 2011
How to check if digium EC module (VPM) is properly installed
After the DAHDI drivers have been loaded execute the following command on the Linux shell to check if the VPMADT032 is installed and operational.
dmesg| grep VPMADT032
Fighting Echo on POTS lines
Using fxotune will help echo canceller to work better.
Do this before setting up echo canceller, it means to disable echo canceller options in /etc/dahdi/system.conf and
/etc/asterisk/chan_dahdi.conf, and to stop asterisk but dahdi still running.