Network Pattern 03
Some Phones and PBX/SIP server are in the same LAN and some phones are in another LAN over the internet.
When a SIP UA is located behind NAT, the following information is required:
Port Forwarding information on the router
SIP exchanger – Local Port [UDP]
Default Value: 5060
RTP Exchanger – From Minimum Port to Maximum Port [UDP]
Default value: 10000-10999
Interface address field on PBX/SIP Server
This field is located on the PBX/SIP Server > Config > System > Network
Interface Address # = Your ROUTER’S global IP Address