i am trying this set up (double NATs) SIP CLIENT (10.1.2.x) ===( NAT1 )===>[ FS1 ]===>( NAT2 )===>[ FS2 ] i am trying to make a call from SIP CLIENT... to FS2 (twilio) for FS1 configuration... $${domain} is set to IP address on NAT1 (10.1.2.1) and ext-rtp-ip and ext-sip-ip are set to IP address on NAT2 (192.168.0.x) side... the "sofia global siptrace on" is showing that requests are sent from FS1 sent to FS2, and FS1 is not getting any response... is there any info regarding double NATs ??? thanks