Hey! Recently bought a couple of ZyXel P-2000W sip ua's and have had trouble registering with SER. It wouldn't even register to iptel's proxy. Anyone have any hands on experience with the matter? Certainly is a nice phone. Direct IP-IP calls within a private network work fine and do not even require a proxy, but have problems calling out. Ideas anyone? The product link below.

http://www.zyxel.com/product/model.php?indexcate=1075688089&indexFlagval...

thanks,

Michael Seppänen