Freeswitch under NAT
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If your M2 box is under NAT, you should edit /usr/local/freeswitch/conf/sip_profiles/external.xml file (find these lines in file):
<param name="ext-rtp-ip" value="auto-nat"/> <param name="ext-sip-ip" value="auto-nat"/>
And change 'auto-nat' to your real external IP, for example, if your external IP is 1.2.3.4, these lines should look like this::
<param name="ext-rtp-ip" value="1.2.3.4"/> <param name="ext-sip-ip" value="1.2.3.4"/>
Forward SIP ports (UDP 5060, 10000-20000) on your firewall to this Freeswitch machine.
Restart Freeswitch:
service freeswitch restart
