Hi, I am able to create extensions, register them on the 3CX softphone, and make calls also. The problem comes when one of the parties terminates the call. Issues are mentioned below: 1) If one person ends the call, the other person's phone should also auto terminate the call, this does not happen. 2) The 3CX PBX server does not recognize the call termination and keeps sending UDP packets to both the parties(3CX softphone shows that no calls are active). Apart from this, I read on the internet that SIP server is only used to initiate the call and then RTP communication is P2P. In 3CX implementation all the RTP or voice traffic is also going through the server (for internal to internal calls also). Is this intentional? Do let me know if you need more information from my end to resolve this issue.