[Freeswitch-users] Recommend an IP Phone for use behind NAT

I am looking into changing my VOIP server to FreeSwitch. My current system uses Polycom SoundPoint IP 335 phones. It has a public IP and the FreeSwitch server will too, but several of the phones are behind a variety of DSL routers that do NAT. These remote users have reported intermittent problems with one way audio. The NAT configuration on the Polycoms allows for a static setting of the public IP. I've been told phones that support STUN should be more reliable. What IP desk phones work best with FreeSwitch for remote users behind a NAT router with a dynamic IP? Thanks, Alan