Support & Downloads

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Contact Info
198 West 21th Street, Suite 721
New York, NY 10010
+88 (0) 101 0000 000
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Develop with our
VoIP Softphone SDK

Develop a custom communication solution leveraging CounterPath core libraries. Deliver immersive collaboration experiences with an industry leading SDK.


Industry Leading VoIP SDK: Integrate and customize communication tools with confidence

Without an VoIP SDK, a lot of voice and communications functionality would have to be made from scratch. VoIP SDK Softphones not only let you create new tools efficiently, but also make the process easier for everyone involved because everything is pre-built. Plus CounterPath’s VoIP SDK is unique in that we provide developer support, with a dedicated team of developers to help troubleshoot code, answer questions and provide support.

Leverage Market Leadership

Using the same core SDK as Bria, receive best-in-class voice quality with stellar audio test results.

Multiple Programming Environments

Core SDK uses C++, wrappers are available for .NET, Java, Objective-C, Swift and Xamarin.

Desktop and Mobile Device Support

Create or integrate with Windows, Mac or Linux desktop, or iOS or Android mobile devices.

Zoiper Alternative

Deploy with Ease and Efficiency

With sample apps and support included, developers can quickly start designing and deploying.


accelerates your custom solution deployment

Enterprises, operators, and solution vendors can leverage the CounterPath VoIP SDK Softphone to accelerate integration of voice over IP (VoIP), video and messaging into their own applications for desktop and mobile devices. Using a single, common SDK with multiple programming wrappers, developers can leverage the same core set of methods and parameters – getting their application to market sooner.

Reliable, superior,
secure communications

When building SIP/IMS compliant applications, engineers can expect excellent voice and audio quality from the SDK through a broad range of Voice Quality Enhancement (VQE) capabilities, such as Acoustic Echo Cancellation, Adaptive Jitter Buffer, Packet Loss Concealment and Noise Reduction. The SDK can also establish secure signaling and encrypted media via TLS and SRTP.


Softphone: Superior interoperability

The CounterPath VoIP SDK Softphone is compliant with SIP and XMPP standards, and has more certifications than any other SDK on the market. Because its core SDK code is already deployed to millions of endpoints via Bria and X-Lite, you can rest assured that your application will be compatible with the industry's leading IP PBX, SBC and UC platforms.

Rest assured
with extended support

When developing software within tight deadlines, programmers cannot afford to wait for weeks for trouble tickets to be resolved. Our SDK is backed up by the CounterPath SDK Extended Support Plan and provides exclusive access to dedicated Engineering resources, including SLA-based trouble tickets with response time guarantees.

Integrate with any call server or VoIP service


``We evaluated several options over the years, and benchmarked CounterPath as part of our ongoing due diligence process, but no matter where we looked we always found the other solutions to be lacking in multiple areas where CounterPath excelled. We really value being able to pick up the phone and talk to an actual software developer at CounterPath, instead of searching through support forums and message boards.``

Mike Yoder


Technical Specs & Resources

Fill out the form below for a custom quote.

See a full list of supported desktop and mobile devices.

Access sample code, guides and get help when you need it.

Interested in developing with our VoIP SDK?

Get in touch with our team today.