[Freeswitch-users] Dialing extensions behind NAT

Hi, Not sure if this was previously asked, my scenario as following. UA1,UA2,UA3===(NAT) ====(Internet)====(FreeSwitch)===(PSTN) When UA1 dial UA2 the traffic go over the internet connection to FreeSwitch and then comes back to UA2. Can UA1 dial UA2 without going to internet? My both phones are Linksys SPA942, please let me know any good phones that can work best with free switch over wan connection. Thanks, AGZ