Comment Re:E-Series Nokia or other WiFi-capable Symbian ph (Score 3, Informative) 289
My N95 is an amazing SIP device. The native SIP implementation means that a SIP call behaves exactly like a normal call. Just dial the number as usual, just choose internet call instead of voice call. It works over wifi and 3G, almost seamless.
As for NAT, I never had any problems with it. It has NAT transversal support.
As for cheap, you can always buy one second hand.