Ask the Telecom Pro – Difference Between SIP and VoIP

Timothy C. Colwell Timothy C. Colwell
SVP, Efficiency First® Adoption

Ask the Telecom Pro

Q: What’s the difference between SIP and VoIP?

A: VoIP is a term that means voice communications over IP networks. There are many different proprietary and open source protocols that can be used to deliver VoIP. Session Initiation Protocol, or SIP, is a specific protocol used to achieve VoIP. While SIP is a method of VoIP, not all VoIP is SIP.

Q: Are state taxes for cell phones assessed based on the area code for the service number?

A: No. Taxes are assessed based on subscriber mailing address, not the area code of the service number. For reference, Nevada has the lowest state tax at 1.9% and Washington state has the highest at 18.6%.

Learn more about the Efficiency First® Framework best practice methodology.

Timothy C. Colwell is a telecom management industry thought leader exploring the impact of technology as a business accelerator and social capital enabler.

How Do You Score? Take Our Free Competitor Comparison!


  • Timothy C. Colwell leads AOTMP’s Efficiency First® Adoption practice, which establishes performance scoring standards, issues enterprise and vendor Efficiency First® Certifications, and manages Efficiency First® Framework development and evolution. He is the lead innovation architect for AOTMP’s Efficiency First® Framework, a disciplined, best practice-driven approach to managing fixed and mobile telecom environments.

2018-02-21T15:31:43+00:00Categories: Ask The Telecom Pro|Tags: , , , |