Everything was working and I decided to update the Firmware of the Patton from 4.2 to 6.3. Now I cannot make calls. It shows the trunks registered and I can receive incoming calls fine. When I try placing a call I see 0/1 go active for 15 seconds then it tries 0/1 and on until it fails and gives a busy signal. The Log shows: "Call or Registration to 8283367688@(Ln.10000@Patton 4114 4xFXO) has failed. [ V4 192.168.50.21:5066 UDP target domain=unspecified mFlowKey=868 ] replied: 502 Bad Gateway; from IP:192.168.50.21:5066" I did create a new config file and same result. It worked before upgrade, I tried rolling back to 4.2 but it does not work either.