I am told that the Betamax softphone does not run correctly under Wine, though I have never tried it myself.
I am using the Ekiga softphone under Ubuntu and it seems to work quite well with Betamax accounts. I have tested it with Voipcheap, Intervoip, Actionvoip and Poivy.
I use the Voxalot Stun server to connect behind the firewall.
Are you using different SIP and RTP ports for the 2 accounts on your ATA?
I am also using a couple of Betamax accounts with my Voxalot account registered on a Grandstream ATA, and generally the calls to PSTN numbers go through with no problem.
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