This approach sounds like a very reasonable measure to actually help subscribers cut costs where they need to and offer a cost-effective alternative to traditional calls - which is of particular importance now that we are facing the large-scale world financial crisis.

4 phone lines with unlimited calling
• 4 phone lines that can be setup in one or multiple offices
• Add additional lines starting at only $4.99/month
• Free, unlimited inbound and outbound calling within the US and Canada
• Local numbers with area codes of your choice
• Each phone line includes voicemail, call forwarding, web-based call management and more

Hosted phone and fax service
• Auto-receptionist, dial-by-name directory, greetings, music-on-hold, message alerts, Outlook integration and more.
• Select a toll free or vanity number for your business for no additional cost
• Internet fax with a dedicated fax number
• 1000 minutes/month included FREE. Applies to main toll free number, Internet faxing and
hosted phone service usage.

Linksys IP phones
• Linksys SPA922 IP phones for only $59.99/phone (additional cost)
• Phones arrive fully configured and ready for use in 3-5 business days – plug and ring
• Speakerphone, caller ID, call hold, conferencing and more
• Includes extra Ethernet port so no router or adapter needed

Advanced call and fax management
• Configure and manage your entire service online
• Add additional numbers via the web, no sales rep required!
• Real-time call control with a virtual phone on your desktop 

Seamless activation and hassle-free setup
• Easy setup for all employees, whether local or remote
• Instantly set up multiple and satellite offices
• No PBX to buy or maintain
• No setup or activation fees

RinngCentral says that its solution requires no additional hardware required and no setup or cancellation fees.

Truphoen Anywhere doesn’t require a user to remember what to do. Whenever an international number is dialed from outside Wi-Fi, Truphone Anywhere simply asks whether he/she wants to make a Truphone call. The user accepts, and Truphone connects the call.

The whole system works by connecting the iPhone to a local Truphone server, which then connects the long-distance part of the call over the Internet. The local connection to Truphone is, typically, free because it uses bundled minutes from the customer’s usual cellular service provider.

• Stable and reliable service that concentrates more on quality than features.
• Freedom Unlimited - $24.99/month for Unlimited Calls to the US, Canada Puerto Rico, US Virgin Islands and Guam and calls to land lines in France, Italy, Ireland, Spain and United Kingdom.
• Low International calling rates. 30-day money back guarantee.