My FreeSWITCH server has 2 IP addresses An Internal 192.168,nnn.nn & an External 107,1.nnn.nn This is accomplished via network 'magic' (I'm not the network guy) using a single network card And, in general, it works. I can Receive Outside calls from our SIP Trunk vendor But I can Not Send calls Out through the SIP Trunk vendor. The calls are being blocked (403 'Forbidden") by the vendor due to the contents of our SIP Header packet. Within the Via: part of the packet it shows: Via: SIP/2.0/UDP 192.168.nnn.nn;rport;branch=z9hG4bKQKa7126jtX4mm They need it to show the External IP here. I have even tried setting sip_via_host = 107.1.nnn.nn but that did not change what it being sent. How/Where can I get this to change?