How Many Phone Lines?
Figure out how often your line is in use.
You should have one outside phone line for every five employees,depending on the type of business you're in and your callvolume. Still not sure if you need more phone lines? Get a"busy study" from your local phone company that willtrack the number of times a caller receives a busy signal on yourtelephone. They may charge you a small fee for this service, butit'll be worth it.
Excerpted from Start Your Own Business: The Only Start-Up GuideYou'll Ever Need