The cost, compared with a traditional multi-line phone system, may make VoIP seem an appealing option. VoIP phones are relatively easy to set up, particularly if you are already connected to a single network.

But before you make the switch, make sure you understand both the advantages and potential risks—and all the associated costs—particularly if your restaurant relies on delivery and takeout orders:

Initial set-up costs: Make sure you understand what extra equipment you might need to purchase to make VoIP work with your existing system.

Caller ID hardware: Does your caller ID adaptor support analog and digital connections? Currently VoIP needs both to integrate with Caller ID, and then to your POS system.

Land line phones: Your existing digital phones may work with the VoIP system, but double-check their compatibility to be sure.

Other equipment: Some common business devices may require an analog phone line to connect—notably fax machines, but also credit card machines, some security systems, and other devices. Don’t disconnect your land line until you’re sure that all your equipment will still work.

Your phone number: If you take orders by phone, one of your most valuable assets is your phone number. Make certain that it is portable to the new system.

Troubleshooting and IT assistance: Many companies assist with initial setup at no charge but you may incur ongoing charges for support.

Long distance: How often do you call out from the restaurant? What do you expect to save in long distance charges?

What’s next?

If you decide that a VoIP system is right for your business, consider these final tips:

Shop around. Explore all of your options, and ask questions. Consider purchasing from a licensed reseller for more competitive pricing and better support.

Contact a Consultant. A phone system consultant will evaluate your needs and make sure your VoIP meets them. Many telecom system resellers offer this initial consultation at no cost.

Get a support contract. Your VoIP system will eventually have problems; at the very least, it will require upgrades.

Know your maintenance costs. Know the details of your plan including per minute, per use, or per line VoIP charges.

Be proactive. Ask for all the admin passwords so you can make changes yourself when needed. Choose a system that you can access yourself for things like changing users; you don't want to have to foot the bill for an IT person to do that.

Carmen Vogel-McCombie is a marketing and tradeshow coordinator at SpeedLine Solutions, Inc., and a contributing editor to On Point: The Restaurant Technology Blog.