Unload the the driver for A800P & B200P will be ok, i just want to figure out if it is because of timing issue. Leave only B100P working on the server and test the fax. I am waiting you on skype.
unfortunately I wasn't able to get back to you until now.
Meanwhile I've migrated the pbx to an ssd and removed the cf card.
Now I get better results with dahdi_test:
Best: 99.999% -- Worst: 99.317% -- Average: 99.826100%
But the issue remains. Additionally, there are clicking sounds In the rx channel of voice calls passing the B100P
Deactivating the other cards did not resolve the problem.
I am waiting for you on skype, pls contact me when you are online. BTW, my working time is GMT +8 09:00---18:00.
If you need support at non-working time, pls send me email for making an appointment and tell me available time.