Hello guys. I have setup the gateway for outbound calls with credentials provided by my ITSP. http://pastebin.freeswitch.org/18749 Trying to make test call using, for example, originate command originate sofia/gateway/mtt.ru/XXXX &txfax(/tmp/fax.tif) result: ITSP proxy sends 500 Gateway is Invalid http://pastebin.freeswitch.org/18750 But, trying to make call using asterisk with the same credentials suprisenly works. Here dump of success call http://pastebin.freeswitch.org/18751 I also attach logs that provided mys ITSP. Don't mind that there is ip address from privite LAN, the first try was from behind NAT. The second, that i provided above (http://pastebin.freeswitch.org/18750), was from vps with staticly assigned address. For the first glance I thought that the root of this problem was NAT but IMO it's not. Also, my external.xml http://pastebin.freeswitch.org/18752