[Asterisk-Users] how to configure Asterisk is outside and the SIP phone (Xlite) is inside behind NAT/PAT

[shaun wu]

Hi, I am configuring a solution. The Asterisk with public IP outside NAT firewall and there is a private LAN behind any NAT/PAT firewall. What are the key points in sip configure file I need to pay special attention? And except allowing the ports for UDP and RTP, do I need to do anything else in the NAT firewall?
 
Thanks much!
Saun

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