I am just begining with Astersik, I configured my sip and extensions configuration files, and when I tried to make a call, the first time everything works but after that calls failed, asterisk show me 408 error, loop detection so unable to create a channel. I noticed also that when I make a call, the IP adress of the caller is number@internal_ip_of_asterisk_server. Because this is the problem but I don't know how to resolve it. I really need you help.
Thks very much ^^