Thanks for the troubleshooting advice... It is *not* a firewall issue It has static IP, @voipinit - you probably mean try disabling it - it is disabled... The main point is that calls come on ATA's other port without any problems; and if I put "official" Voipo adapter - the calls come fine as well.

I also noticed that my in-laws' calls (in-Voipo network) also always come through; however, non-Voipo calls go to failover number 9 times of 10. So, back to my original question - anybody using BYOD SPA or PAP2-NA to share the experience?