[Freeswitch-users] NAT issue with registration responses going to the wrong port

[Alex Kinch]

Hi gang,

Got a strange problem with a NAT'd device that's trying to connect to  
FS. The first REGISTER arrives, without auth, and FS responds with 401  
Unauthorized to the correct port on the external IP address of the  
firewall. However when the second attempt to REGISTER, this time with  
auth, comes in, FS responds with 200 OK to the local SIP port  
specified on the device. The device obviously doesn't get the 200 OK  
so keeps attempting to register.

Any ideas? Tried sip-force-contact but that doesn't seem to help.

Alex