Figure out the right IP-Based connection from an enterprises’ telephone system to the service provider’s network.

With a virtual connection to the PSTN, SIP Trunking helps an organization scale, it allows for more operational cost savings. It improves voice capabilities and the overall call experience.

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  • Cost-savings by consolidation and converging voice, video and data over one access line and getting rid of redundant lines (DSL, cable, T1, Ethernet)
  • Free on-net calls between worksites including those that are international
  • Reduced local and long-distance calling plans and rates
  • Local numbers wherever you are, eliminating multiple 800 numbers
  • Can share trunk/bandwidth across sites and can dynamically scale during growth by adding more trunks
  • SIP Providers can help with DR Planning
  • E911 integration and routing support
  • Some Providers will provision trunks for traffic overflow, avoiding call busy signals

How a customer should choose a SIP Provider?

  • Ability to port numbers
  • The vendor’s network size
  • Resources and capacity to handle large call volume
  • Record of call quality and reliability
  • Providers engineering assistance to integrate SIP with exisiting network (i.e. how many voice channels can the network support, compression recommendations – TBI’s rule of thumb which is an overestimate is 100kbps/trunk)
  • What is the Provider’s pricing and customer's cost savings?
  • What does their security, technical support and availability look like?
  • How easy is it to deploy?

Provider Options

The following should help partners and customers alike understand TBI's Provider options and circumstances where each SIP Provider is most successful.

Hosted Voice Providers like Mitel and Vonage are best used when PBX systems are close to end-of-life, where partner can get their foot in the door with that provider for SIP and ultimately migrates that customer into a Hosted VoIP or UCaaS solution in near future.

Particularly for Enterprise: Premium providers like West IP are great for Cisco environments and Masergy is really strong for latency-sensitive and security-focused environments.

On the Telco side, AT&T, CenturyLink and Verizon are always a solid choice for any customer in Mid-Market and Enterprise. They are always competitive, available almost anywhere and reliable on their networks.

Options like Level 3 and Intelepeer have the greatest number portability. They should almost always be included for large customers with geographically dispersed locations that are looking at Over the Top/BYOB. Intelepeer is TBI's only approved Cisco Spark IP PBX vendor.

Aggregators such as MetTel, BCN and AireSpring are best for customers seeking to move future services to a Provider for consolidated, single-billing.


For more information take a look at an analyst article and infographic provided by Intelepeer.

Download as PDF here.



About the Author

As Director of Marketing at TBI, Cohen is responsible for managing TBI’s marketing communications and implementing multi-channel branding and press strategies. In addition to driving TBI’s overall marketing strategy, Cohen directs both internal and external communications to ensure the delivery of valued products and programs to providers and partners alike. You can contact Corey at or connect with her on LinkedIn.