SHARE



ABOUT THE AUTHOR


Jim Allen
Jim Allen has over 30 years of experience helping enterprises with strategy, architecture and deployment of Unifying Information Technologies. As...
Read Full Bio >>
SHARE



Jim Allen | January 27, 2014 |

 
   

Delivering Highly Available Voice Services Using Technology and Carrier Diversity

Delivering Highly Available Voice Services Using Technology and Carrier Diversity When prioritizing the delivery of highly available voice services, technology and carrier diversity could be key.

When prioritizing the delivery of highly available voice services, technology and carrier diversity could be key.

Introduction
SIP trunks have proven to drive costs savings, boost flexibility and address capacity challenges, but how do you ensure that your designs will deliver the high availability needs of your enterprise? Before completely retiring legacy TDM trunks, consider the benefits of blending them with your SIP trunks and taking advantage of technology diversity to drive higher availability. If your requirements demand ultrahigh availability, then take it a step further and consider carrier diversity.

In this article, we will cover a number of designs that blend the use of new and traditional technologies as well as multiple carriers to deliver highly available solutions for your voice environment. Regardless of your voice needs, technology and carrier diversity can provide simple and often cost effective ways to guard against downtime of voice services.

SIP Trunk Deployment Using Site Diversity
In a simple SIP trunk deployment, a carrier will provide inbound and outbound voice services over an IP Wide Area Network (WAN) connection (Typically MPLS or Internet). There are two deployment models in this case. The option you choose depends entirely on the carrier you procure your SIP trunk service from.

If you obtain SIP trunk services from your existing WAN MPLS vendor then you can simply consolidate voice and data services on the same physical links. This option produces some of the most attractive financial benefits, since you eliminate separate physical voice and data circuits. If you instead use different providers for SIP trunk and WAN services, then you'll need to deliver your voice service over-the-top of your WAN. In this case you need to provision separate physical links to your SIP trunk provider.

Regardless of your deployment strategy, one of the main advantages of using SIP trunking is the ability to terminate these services in multiple data centers. With this approach you provide a very simple, cost-effective and highly available solution.

In the following diagram you can see how voice services from a single carrier are delivered to multiple data centers to create high availability through site diversity.

With this design, it's also important to split the call control function across the two data centers and maintain heartbeat via a back channel (in this example Metro Ethernet). This ensures that both call control and carrier services remain available in the event of a single data center failure.

External or off-net calls are delivered to and from remote offices via the data center trunks by routing this traffic over-the-top of the second carrier MPLS WAN. Enterprise Session Border Controllers (E-SBCs) provide the enterprise security boundary between you and the voice service provider, while carrier Session Board Controllers (SBCs) provide the security boundary between you and other enterprises. E-SBCs, in this case, also provide additional benefits like addressing fax issues, manipulating SIP headers, and protocol interworking. See my September article titled "Enterprise SBCs: Why they're so Important" for additional information on the value of E-SBCs.

Next page: SIP Trunk and PRI Technology Diversity





COMMENTS



August 16, 2017

Contact centers have long been at the leading edge of innovation in communications technology, given their promise of measurable ROI and the continual need to optimize customer interactions and sta

July 12, 2017

Enterprises have been migrating Unified Communications & Collaboration applications to datacenters - private clouds - for the past few years. With this move comes the opportunity to leverage da

May 31, 2017

In the days of old, people in suits used to meet at a boardroom table to update each other on their work. Including a remote colleague meant setting a conference phone on the table for in-person pa

August 16, 2017
World Vision U.S. is finding lots of goodness in RingCentral's cloud communications service, but as Randy Boyd, infrastructure architect at the global humanitarian nonprofit, tells us, he and his team....
August 11, 2017
Alicia Gee, director of unified communications at Sutter Physician Services, oversees the technical team supporting a 1,000-agent contact center running on Genesys PureConnect. She catches us up on th....
August 4, 2017
Andrew Prokop, communications evangelist with Arrow Systems Integration, has lately been working on integrating enterprise communications into Internet of Things ecosystems. He shares examples and off....
July 27, 2017
Industry watcher Elka Popova, a Frost & Sullivan program director, shares her perspective on this acquisition, discussing Mitel's market positioning, why the move makes sense, and more.
July 14, 2017
Lantre Barr, founder and CEO of Blacc Spot Media, urges any enterprise that's been on the fence about integrating real-time communications into business workflows to jump off and get started. Tune and....
June 28, 2017
Communications expert Tsahi Levent-Levi, author of the popular BlogGeek.me blog, keeps a running tally and comprehensive overview of communications platform-as-a-service offerings in his "Choosing a W....
June 9, 2017
If you think telecom expense management applies to nothing more than business phone lines, think again. Hyoun Park, founder and principal investigator with technology advisory Amalgam Insights, tells ....
June 2, 2017
Enterprises strategizing on mobility today, including for internal collaboration, don't have the luxury of learning as they go. Tony Rizzo, enterprise mobility specialist with Blue Hill Research, expl....
May 24, 2017
Mark Winther, head of IDC's global telecom consulting practice, gives us his take on how CPaaS providers evolve beyond the basic building blocks and address maturing enterprise needs.
May 18, 2017
Diane Myers, senior research director at IHS Markit, walks us through her 2017 UC-as-a-service report... and shares what might be to come in 2018.
April 28, 2017
Change isn't easy, but it is necessary. Tune in for advice and perspective from Zeus Kerravala, co-author of a "Digital Transformation for Dummies" special edition.
April 20, 2017
Robin Gareiss, president of Nemertes Research, shares insight gleaned from the firm's 12th annual UCC Total Cost of Operations study.
March 23, 2017
Tim Banting, of Current Analysis, gives us a peek into what the next three years will bring in advance of his Enterprise Connect session exploring the question: Will there be a new model for enterpris....
March 15, 2017
Andrew Prokop, communications evangelist with Arrow Systems Integration, discusses the evolving role of the all-important session border controller.
March 9, 2017
Organizer Alan Quayle gives us the lowdown on programmable communications and all you need to know about participating in this pre-Enterprise Connect hackathon.
March 3, 2017
From protecting against new vulnerabilities to keeping security assessments up to date, security consultant Mark Collier shares tips on how best to protect your UC systems.
February 24, 2017
UC analyst Blair Pleasant sorts through the myriad cloud architectural models underlying UCaaS and CCaaS offerings, and explains why knowing the differences matter.
February 17, 2017
From the most basics of basics to the hidden gotchas, UC consultant Melissa Swartz helps demystify the complex world of SIP trunking.
February 7, 2017
UC&C consultant Kevin Kieller, a partner at enableUC, shares pointers for making the right architectural choices for your Skype for Business deployment.
February 1, 2017
Elka Popova, a Frost & Sullivan program director, shares a status report on the UCaaS market today and offers her perspective on what large enterprises need before committing to UC in the cloud.
January 26, 2017
Andrew Davis, co-founder of Wainhouse Research and chair of the Video track at Enterprise Connect 2017, sorts through the myriad cloud video service options and shares how to tell if your choice is en....
January 23, 2017
Sheila McGee-Smith, Contact Center/Customer Experience track chair for Enterprise Connect 2017, tells us what we need to know about the role cloud software is playing in contact centers today.