WHEN YOU STARTED your first business, who answered the phones? Was it you? Your mother? That nice guy you hired for his baritone pipes, until he billed thousands of dollars in inappropriate charges to your fledgling firm?

It probably didnt take long to realize that you need to immediately make a strong, professional impression for your clients to take you seriously. You want them to make contact and imagine a corporate army at the end of the line, even if your troops consist of just a dedicated three or four.

The solution for more and more small businesses is voice over IP, or VoIP — the shorthand for phone systems that run through the Internet rather than over traditional telephone networks.

VoIP companies often specifically target small businesses, offering full business telephone services — from automated voice answering to conferencing — without having to buy a $50,000 piece of communications hardware the size of your garage beer fridge. Aptela is one example: All you need is a broadband connection — T-1, cable modem or DSL will do. Aptela doesnt even require you to buy specific phones, though the company does recommend Polycom softphones.

Service plans that include unlimited calling start at $29.99 per month, but the Herndon, Va., company also offers a 250-minute business calling plan or a metered usage plan. The price can be 40 percent to 60 percent cheaper than comparable service from a telephone company.

Most small companies want to know, How can I look bigger and have the appearance of a Fortune 500 company? says Larry Barker, president and CEO of Aptela. The companys auto attendant service provides automated phone answering and routing functions with voice talent and scripting customized for your business.

The auto attendant not only asks who is calling, but also announces the caller after the connection is made. (Who said the age of heraldry had come and gone?)

Other key features include conferencing, integrating with Outlook and routing calls to mobile phones, which comes in mighty handy for a small company.

You can be in different cities or at a vacation home or a hotel, and no one knows, Barker says. These are the kinds of features that can help make a start-up company seem like its been in business forever.

Peter Norton, the owner and managing partner of Sanford Rose, an executive recruiting firm, says his experience with the auto attendant feature has been good so far.

We feel like it gives us a competitive advantage because were always on the phone, he says, but we need to be available and know whos calling.

That point isnt lost on Steve Roberson, the co-founder and technical lead of Start-Up Hire, a new job site for venture capital-backed companies.

It makes your company seem more polished — like it has a cohesive presence, even if everyone is spread out, Roberson says. As Roberson puts it, its like that old New Yorker cartoon: On the Internet, nobody knows youre a dog.