Just to remember one option.
Bu default, when Asterisk working behind NAT and parameters like localnet and externaddr are set properly, it automatically uses internal address in SIP/SDP messages for internal connections and external for external.
Freeswitch can do same, but needed a bit more option to use.
Profile settings
<param name="ext-sip-ip" value="autonat:$${external_sip_ip}"/>
<param name="ext-rtp-ip" value="autonat:$${external_rtp_ip}"/>
<param name="local-network-acl" value="localnet.auto"/>
Point on autonat: prefix. Yes, I know it described in wiki, but never the less. Without it, FreeSwitch will use ext-rtp-ip address in all messages regardless are they internal or external.
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