Service interruptions should be rare and vendor support should be minimal. Rates are different. Be sure that you understand your business calling patterns when getting proposals. Know these differences and communicate them to prospective vendors. As far as rates go, this is the measuring stick.
Customer service is different, too.
Read the contract carefully. You are probably signing for a minimum amount of volume for a set period of time. In other words, you might have to pay for using the service less than you do now. All rights reserved .