Hi, Is there anyone used Yeastar U100 as a voip gateway on 3CXv15. My problem was I cant received any call from U100, but 3CX phone can able to call the local extension on U100 and even used as a PSTN gateway. U100 extension unable to call extension from the 3CX. With this I cant forward all incoming call from U100 to 3CX. Can you guys give me a basic setup on this two phone system?