-dn 1 dual-line number 101 label GAD description Office name Office call-forward busy 222 call-forward noan 222 timeout 10 ephone-dn 2 dual-line number 102 label Lauren description Lauren name Lauren call-forward busy 222 call-forward noan 222 timeout 10 ephone-dn 3 dual-line number 103 label Meghan description Meghan name Meghan call-forward busy 222 call-forward noan 222 timeout 10 ephone-dn 4 dual-line number 104 label Colleen description Colleen name Colleen call-forward busy 222 call-forward noan 222 timeout 10 Next, I'm going to assign an ephone-DN for what I'll call the general line. In this en- vironment, there is only a single outside phone line. I'll be configuring this line on every phone SO that when a call comes in, every phone will ring and the button will light. As I've already said, IP telephony is an almost limitless topic. This may not be the way you would design your system. Since every installation is different, I encourage you to discover more about VoIP to learn how to configure different solutions. Small-Office VolP Example I'm assigning the line number 111 for this purpose. As you'll see in a minute, it's im- portant to keep this within my dialing plan: ephone-dn 10 dual-line number 111 label Outside-Line name Outside Line call-forward busy 222 call-forward noan 222 timeout 15 I learned the hard way that even when I had only one outside POTS line feeding the system, I still had to configure the extension as a dual line. Without dual line configured on this line, when someone on the system calls voicemail from this extension, the extension becomes busy, even though the outside line is not in use. In this case, incoming calls will get forwarded to voicemail with a call-forward busy configured, or get fast busy without. With dual line configured, should a call come in while the line is busy with a call to voicemail, the phone in use will beep and display the caller ID of the incoming call. Paging Here's a nice feature that's simple to install. We'll create a special dial number that, when dia