[Freeswitch-users] RTP Triple NAT Traversal

[Bill Ross]

Folks

 

FS: 1.4.13 / OpenWrt

 

Topology

 

SIP Phone           <-> WIFI AP / NAT <->   Cloud <->            Router /
NAT <->             Router / NAT <-> FS

 

192.168.10.x                                                       Public IP
192.168.1.x                         10.0.0.128

 

The SIP packets traverse the NAT chain correctly.

The RTP packets from / to Phone are from / to 192.168.10.x, so, not getting
through (because private N/W addresses embedded in SIP messaging)

 

I am considering the following methods of handling this, but, before doing a
lot of work / research, is there a better method? 

 

1 - Using firewall rules (somehow, if possible, connection tracking?) to
SNAT/DNAT packets to/from private network ranges which are not local lan
range

2 - (appears simplest) Using channel variables (addresses) from SIP
messaging to alter addresses prior to bridge.

 

Any thoughts?

 

Thanks;

Bill Ross

 

 

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