Hi again....after days of testing and Firewall/NAT configuration, at the end I can receive calls from external PSTN lines. But there is the big problem as in the subject....I can't make external calls!!! I think the PBX it's not using the outbound rules. I tried with 2 rules, one with numbers starting with 0 and another starting with 9. The log is the below: 01:48:01.156 StratInOut:nCancel: Call from Ext.101 to 9????????? has been terminated 01:48:00.062 CallConf:nIncoming: Incoming call from Ext.101 to sip:firstname.lastname@example.org and x-lite softphone is beeping and telling: Call Failed: Temporarily Unavailable and Grandstream phone is giving error 480.... HELP!!!! I already lost all my hair!!!