n the company, I will assign line 111 to be the outside line. This will also be the general mailbox for callers who don't know who they want to speak to. If you have multiple locations, you'll need to come up with a more complicated plan that makes sense. Just remember to account for growth; however many offices you have now, you may increase this number by at least one order of magnitude over time. If you've got 10, count on 100. If you've got 130, count on 1,000. Why? Because it's easier to get users used to long numbers now than it is to change the dial plan in the future. I'd go SO far as to say that it's easier to get everyone in a company to convert from Windows to Mac than it is to have them learn a new dial plan. People don't like change, especially when it comes to their phone system. Logical dial plans make your dial peers simpler. They also make your numbering scheme easier to understand. If you've got 100 branches with five users in each branch, consider six-digit extensions like BBBXXX, where B equals the branch number and X equals the extension number. Thus extension 501002 would be extension 2 in branch 501. Users within branch 501 could just dial 2, but users in other branches would need to dial 501002. The five users in my company and their extensions are shown here: Lauren Meghan Colleen General There are no hard and fast rules here, but try to make it scalable. My solution here is fine for a small company that will never grow, but what happens when I get an 11th user? Suddenly I'll have users who have extension numbers higher than the general mailbox. The users won't care, but it can cause headaches when we need to create dial peers. Voice Ports This router has a POTS line connected to it. The POTS lines are connected into a four- port FXO card in HWIC slot number 1. I'm going to configure only one of them for now: Chapter 30: VolP R1-PBX(config)#voice-port 0/1/0 R1-PBX(config-voiceport)#connection plar 111 R1-PBX(config-voiceport)#caller-id enable The caller-id command should be obvious. It al