Hi all, I have following question regarding NAT=1: 1. Does NAT=1 apply to SIP.conf, MGCP.conf, H323.conf and IAX.conf ? 2. Suppose I have following deployment SIP-phone -----INTERNTET-----Asterisk a. Can both SIP-phone and asterisk have 192.168.XXX.XXX ip address , and with NAT=1 to make the call go through ? b. Can SIP-phone with 192.168.xxx.xxx ip address, and asterisk has a public IP address, and NAT=1 to make the call go through ? c. Can asterisk with 192.168.xxx.xxx ip address, and sip-phone has a public IP address, and NAT=1 to make the call go through ? Bascially, I like to understand what NAT=1 mean to sip-phone ip address or to asterisk ip address or to both ??? Please advise. Thanks, George Lin