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About OpenCNAM

New school technology. Old school support and service.

At Telo, we set out to make OpenCNAM easy to access and simple to integrate, no matter what stack you use. Offering expansive coverage that goes far beyond the North American dialing plan, while always using carrier supplied values first, OpenCNAM also has the industry's highest match rates and is supported by a committed team of telecommunications professionals that care about the customer. Unlike some companies in the industry, Telo puts the customer's needs first by providing friendly, knowledgeable, and continuously-available support to every customer.

Getting Started

Other Providers

  • Request for access and a sales pitch is often required before you can try the product.
  • Strict legal terms of use to review and non-disclosures to execute.
  • Manual intervention required to create an account. Very little control over your account.


  • Sign up and get started in minutes.
    Yes, it really is that easy.
  • Easy to understand terms of use and no NDAs to sign.
  • Full control over your account through a robust control panel.

Using the Service

Other Providers

  • "Mystery-Meat" data descriptions causing confusion as to what you are being provided.
  • Archaic technologies that require a lot of time and sometimes workarounds for integration.
  • Sales heavy teams with unresponsive and uninformed support staff.


  • OpenCNAM always returns carrier supplied values whenever available. No exceptions.
  • Advanced technology that is stack agnostic, well documented, and easy to integrate.
  • Support representatives and engineers that are always available.


Other Providers

  • Legacy platforms that are mainly marketing copy updates not product advancements.
  • Poorly documented services that are built on inefficient infrastructures using outdated programming technology.
  • Platform integration is left up to the customer's engineers.


  • Continuous platform support development. Existing support for SS7, SIGTRAN, ENUM, SIP, along with our original RESTful API.
  • An infrastructure that was designed to scale using new technology that delivers low-latency world-wide with 99.999% availability.
  • An integration guide library including Broadsoft, Metaswitch, Sonus, FreeSwitch, FreePBX, and more. Platform experts available for bespoke integration projects.

Customer Experience

Other Providers

  • Lack of customer appreciation. Focused on protectionism rather than innovation.
  • Rigid pricing models with strict minimum volume commitments.
  • Support that can be difficult to find once the contract is signed.
  • Inconsistent data products that are optimized for low costs and not for quality.


  • Going above and beyond for our customers; Our customers are why our company exists.
  • No commitment required for use. Optional, simple, and flexible volume-based pricing.
  • Knowledgeable, friendly, easy to find support for every type of customer.
  • Carrier-supplied values always used, whenever available; No substitutes.

Ready to leave difficult behind and say hello to easy?

The History of OpenCNAM

  • 2011

    OpenCNAM is Born In 2011, the first RESTful Caller ID API was introduced featuring CNAM from the databases that housed carrier supplied CNAM values in North America. Back in 2011, the need for a modern API that delivering Caller ID to the new world of engineers working with HTTP and SIP protocols was clear.

  • OpenCNAM gains support from the developer community and becomes a staple for many open source projects such as FreePBX.

  • Development of Version 2 begins with the goal of offering a real-time network CNAM by directly querying the authoritative storage providers for each carrier through a paid OpenCNAM service level.

  • 2012

    Version 2 Launched With the launch of V2 in 2012, OpenCNAM begins to gain praise from several high-profile influencers in the tech world such as David Weekly, a former Google product leader.

  • 2013

    More Popularity Within the Open Source Community Several more open source integrations surface. Open source developers begin to built OpenCNAM into projects like CyanogenMod, and build libraries, wrappers, and plugins for a wide variety of programming frameworks.

  • 2014

    Telo is Formed In late 2014 Telo was formed by Chris Brunner and Brent James, partner in the company that founded OpenCNAM. The focus at Telo was build telco-rooted data products that made life easy for engineers and provided a clear value-add for companies.

  • Telo recruits and adds talented core team members and consultants to build out its vision of the company and products.

  • 2015

    Development of Version 3 Begins Work on V3 begins with a goal of making OpenCNAM an international carrier-grade service in terms of latency, accuracy, reliability, compatibility and support.

  • The vision of creating the first international carrier-grade Caller ID API begins to become a reality as carrier relationships are formed and data partners are carefully analyzed and selected.

  • 2016

    Version 3 is Launched In early 2016, after a year of product development, Telo unveils OpenCNAM V3. The third generation of OpenCNAM boasts the Plus service level, which brings name coverage in the +1 dialing plan up to approximately 87% and offers 57% coverage across more than 200 countries world-wide.

  • The launch also features new interfaces support for telephone carrier technologies including SS7, SIGTRAN, ENUM, and SIP alongside the original RESTful API. These new interfaces and OpenCNAM's account flexibility now make managing mixed networks easy.

  • Telo begins engaging platform experts to publish official integration guides. Platforms such as Broadsoft, Sonus, Metaswitch, Asterisk, FreeSwitch, FreePBX, and many others now come complete with guides and support to make integration simple.

  • As Telo continues to make things easier for carriers, the original modern RESTful API continues to gain popularity amongst the programming landscape. OpenCNAM is featured on ProductHunt exposing it to a wider range of developers.

  • 2017

    Telo Forms Several Key Partnerships Twilio contacts Telo to offer OpenCNAM to their customers through their Addon Marketplace. OpenCNAM's international Caller ID service becomes available to over a half a million developers world-wide.

  • Telo forms a partnership with netsapiens to offer OpenCNAM to hundreds of carriers using the netsapiens platform.

  • 2018

    OpenCNAM Celebrates 8 Years of Service

Interested in chatting with us about what we are working on?

OpenCNAM is powered by Telo

We have been delivering Caller ID to telephone carriers for years.


A large customer base of telephone service providers.

5 Billion+

Billions of queries fulfilled for carriers around the world.

7 Years

Carrier-grade service with 100% uptime since it was launched in 2011.


Global caller name coverage delivered to carriers around the world.

We are passionate about telecom and because of this passion, we are proud to work on behalf of carriers around the world to help them deliver a better product to their customers.

At Telo, we believe:

  • Great companies focus on customer needs.
  • Great products should solve problems and be easy for customers to use.
  • Great teams have a common goal and passion for what they do.

Want to know more about Telo?