Can asterisk through the NAT without any other software?

I use ser sip to be my sip proxy, but it still can’t talk behind NAT in different network.Can someone tell me how to solve this problem?

Can asterisk through the NAT without any other software?

Thanks for help!!

Yes search for SIP and NAT in the wiki. The firewall has to have many ports opened and sip.conf needs some specific settings.

Could you tell me the key word that I can search from wiki?
Because i only find some basic in wiki

Thanks!!

http://www.voip-info.org/wiki/view/Asterisk+SIP+NAT+solutions

and

http://www.voip-info.org/wiki/view/NAT+and+VOIP

should get you started