Hello everyone, My first post. I have recently discoverd 3CX and am having a lot of fun discovering what can be done with SIP. My main use for 3CX is to link various 2 way radio systems. So far, all has been easy, simply configuring Roip (Radio over IP) boxes to call each other automatcially and off you go. I am trying add in an OMNITRONICS IPR120 SIP selector to the system. But whenever I try to make the selector call one of the Roip boxes, it does not connect and I see the follwoing in the srever log: 00:47:00.920 [CM500002]: Unidentified incoming call. Review INVITE and adjust source identification: INVITE sip:firstname.lastname@example.org SIP/2.0 Via: SIP/2.0/UDP email@example.com;branch=z9hG4bK1247634278;received=192.168.2.53 Max-Forwards: 70 Contact: "firstname.lastname@example.org"<sip:email@example.com@192.168.2.53> To: <sip:firstname.lastname@example.org> From: "email@example.com"<sip:firstname.lastname@example.org@192.168.2.53>;tag=1552054934 Call-ID: email@example.com@192.168.2.53 CSeq: 20 INVITE Allow: INVITE, ACK, INFO, CANCEL, BYE, OPTIONS User-Agent: oSIP/IPR-ua Content-Length: 0 Now the Omnitronics device is extension 153, and from what i can see in the log, the server does not like its credentials. My question is: Can i configure 3CX to process this call without modifying the credentials in the omnitronics box? IE can I make 3cx ignore the fact that it cannot identify who is making this call??? Am I completely off the track with this? Thanks. Ev.