What are some alternatives?
When comparing Vitelity and TDS Business VoIP, you can also consider the following products
Eir SIP Voice - eir SIP Voice is revolutionizing the core communications tool of business that carries both calls and data over just one connection.
Mitel - Business Communications and Collaboration
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
CounterPath Softphone Client Suite - CounterPath enables users to make VoIP audio and video calls, send instant messages and manage their presence in an easy-to-use software.
BVoIP - BVoIP allows to easily add Cloud & On-Premise VoIP PBX to the product offering without having to re-invent the wheel or add another layer to the daily operations..
VoIP.ms - VoIP.ms is a VoIP origination and termination tool.