SMB's can also save money on different (cheaper) telephone provider.
While working for an SMBs, you always have to look where to save money. Virtualization and server consolidation is one of the ways to save money for a company. This money, which otherwise would be spend in electricity, airconditioning or large number of physical server hardware to maintain. At the same time as a part of your job as an IT guy, you probably work on your disaster recovery scenarios and thinking where else you could save money.
To maintain the company's IT system on highest possible level of resiliency and availability. Seeking cheaper ways of doing the same job must be part of your job as well.
And one of those ways it can be interesting to look around for cheaper solution, is cheaper tel. provider. The phone calls can get costly for an SMB or larger company.
You as an IT guy, you are probably in charge the company's phone system, and so you must have enough knowledge to assure the daily tasks concerning the phonesystem's maintenance. Depending of course the size of the company and the size of the IT team there. You could also join the company where the phone system itself was already in place and so the one part of your job in this situation can be seeking cheaper solution with the same hardware.
Depending on in which country you're located, you might be thinking that getting a non standard country tel. number in order to make your customer feel that your company has a world wide location. So You build the brand globally by considering alternative to 0845 numbers, which are numbers not attached to the country's standards, but using the alternative number as a redirect to the classic land line. Those numbers would give you national and professional image.
You might be also interested in the Exchange 2010 training which discusses the new Unified Messaging feature of Exchange 2010 and provide a fully automated voicemail system with multiple languages supported using auto attendants. Read my post about this training here.