have you registered sipgate both at ATA and sipsorcery? sipgate can only be registered at one service, either at your ATA or at sipsorcery. sipsorcery's function is a web switch and a ATA. If you rigistered sipgate on sipsorcery, then you cannot register it on your ATA.
you need show your settings for the registration, have you used stun server.
you need show your settings for the registration, have you used stun server.