Hi All, I configured the Asterisk sip proxy on a Linux box (with NAT) and I am using SJphone on windows as the clients. My SJphone on the private site is registered on to the SIP Proxy. But the one on public site is not and it is set to PC-to-PC call mode. When I initiate a call from private site to public site using the following command: publicphone@219.192.183.111 where 219.192.183.111 is the public IP address of the SJphone on the public domain. It works fine if I hard code this IP address in either extensions.conf or sip.conf However, I do not want this setting since it is inconvenience for entering the callee IP address into the configure file all the time if the calleed IP address changes very frequently. Is there any possible way to configure this IP address dynamically? Is there any way to use the variable similar to ${EXTEN} for getting this IP address? any one can help? I appreciate .. __________________________________ Do you Yahoo!? Friends. Fun. Try the all-new Yahoo! Messenger. http://messenger.yahoo.com/