Please Help!
 

I have registered with voxalot aand successfully added some providers. They are two accounts with internetcalls.com, onw with sipdiscount.com and another one with sipgate.co.uk. The sipgate is for inbound only. My problem is that I can not receive any incoming calls however outgoing calls are fine.
Tha ATA is Zyxel P2002 and has two line ports. The voxalot is registerd on line one. Stun is enabled and also tried disabled. I have linksys BFSR41 router and also tried with Netgera 614 series router. Is there anything I should be adding/correcting either on providers list etc on voxalot pages or to ATA configuration details? Thanks.