Hello, I have a Linksys SPA3000 Gateway to be the SIP-PSTN trunk. I registered it to 3CX and everthing works perfect, but the Caller ID! When somebody calls SPA3000 acqires the CID info perfectly from the land line. But if the configurations are to be sending it to 3CX, everthing collapses. It fails when trying to forward that incoming pstn call to VoIP. Everytime 3CX rejects or line drops. If the configuration "PSTN CID For VoIP CID" is set to "NO" in the SPA3000 settings, everything works well without any CID number carried to 3CX. If it is set to "YES" gateway doesn't work and carries the land line calls to IP destinations. my 3CX Licence is Standard Annual 15.5.9348.3 Linksys/Cisco SPA3000 firmware version is 3.1.20(GW) I need to use the system with CID function. Is there anybody to know what to do and how to solve the problem? Thank you.