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To connect a remote extension which is behind NAT to another system that is behind NAT, do the following:
- First check that all ports are open and forwarded on the router/firewall on the system side
- Login to the system administration
- Navigate to 'Settings: Protocols: SIP/IAX' and set following values:
- Set 'Bind Address'='0.0.0.0'
- Set 'External IP' to system static external/Internet IP address (e.g. 213.45.133.21)
- Set 'External Host' to DynDNS address if used by your system (e.g. system1.dyndns.org)
- Set 'Local Network' to a local network address of a LAN where system is located (e.g. 192.168.1.0)
- Set 'NAT'='Yes'
- Navigate to 'Extensions'
- Edit remote extension that is to register to the system
- Set 'NAT'='Yes'
- Click on 'Save'
- Restart the system
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