Zttest Results - Please Comment

Using Sangoma A200 FX0 card and 80% of incoming faxes fail. I don’t quite understand the tool, but I did a zttest and get the following:

@asterisk_miami zaptel]# ./zttest Opened pseudo zap interface, measuring accuracy... 99.987793% 99.987793% 99.987793% 99.987793% 99.975586% 99.987793% 99.987793% 99.987793% 99.987793% 96.301270% 99.987793% 99.987793% 99.987793% 99.987793% 99.987793% 99.987793% 99.987793% 99.987793% 99.987793% 99.987793% 100.000000% 99.987793% 99.987793% 99.987793% 99.987793% 99.987793% 99.987793% 99.987793% 99.987793% 99.987793% 95.324707% --- Results after 31 passes --- Best: 100.000000 -- Worst: 95.324707 -- Average: 99.718451
First, is 99.7% bad? What could be causing this problem? How can I get Asterisk out of the picture and test the lines to see results? And second, am I really measuring my FX0 connection? Because zttest says “Opened pseudo zap interface”.

My users are also experiencing dropped calls over the ZAP channels and occasional noise.

Thanks

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