Business VoIP Services in DC, Virginia and Maryland

TSI is pleased to offer you a way out of the sky-high phone bills and unreliable communications that come along with traditional phone systems. We want to help you switch to VoIP – an innovative technology that lets you make and receive calls over the Internet, regardless of where you’re located – giving you greater cost savings and more flexibility than ever before.


Our team makes the process of switching to VoIP incredibly painless with three simple steps:

1. Send us your phone bill (and make $100 in the process):

Send a PDF of your most recent phone bill to and we’ll tell you exactly what type of savings you can expect (and send you a $100 Amazon gift card in the process.)

2. Book a quick and painless demo (and again, make a $100 in the process):

Schedule a demo of our VoIP system and we’ll show you what features are available and how fantastic the service really is. (and again, send you a $100 Amazon gift card in the process)

3. Switch over to VoIP with ease:

Make the switch over to VoIP – it’s an easy transition with a minimal learning curve – in order to lower your monthly phone bill, enhance flexibility, and take advantage of a multitude of great features, such as:

  • Auto-attendant
  • Conference calling
  • Caller ID
  • Call monitoring/recording
  • Custom hold music/information
  • Dial-by-name directory
  • Multiple phone numbers
  • And much, much more
That’s a total of $200 FREE for taking the right steps to get started. Once you’ve switched to VoIP, the savings are endless. Send us your phone bill now: to get started or fill out the form.
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Cindy Miller Mount Vernon Internal Medicine

“After hiring TSI to manage our network, We noticed immediate results – the voice quality on our phone system drastically improved, as well as overall speed and performance of our systems. They saved us over $70,308 in bandwidth costs by redesigning the network across all of our offices. And our servers are now running in TSI’s cloud platform, so we don’t need to worry about power outages and downtime affecting all of our offices. Their response time is excellent when we do call for support – usually the problem is resolved in under an hour from the time we make the first phone call. We consider TSI an invaluable partner in our medical practice, and would absolutely recommend them.””