Hey everyone, I am noob to the cs1000. I am having a problem with one of my sites and their extensions. When dialing their 4 digit ext., the phone will ring and then pick up as if someone is on the line, but I can't hear them. Now if I were to dial their full number at the said site, I get through just fine and can hear them and vice versa. Can someone please enlighten me on what would cause this issue. Like I said before, I am a noob to the cs1000, and have navigated it pretty well thus far, but this has me stumped. Thanks to all who reply.