Ozeki VoIP SIP SDK provides a first-rate technology for softphone development. Instead of wasting time for long development process on your own, you can take advantage on this decent software development kit. You will see how easy it is to create a softphone when you use Ozeki SIP SDK. A basic programming knowledge is enough, since Ozeki SIP SDK provides the base for the VoIP solution you are working on.

On the pages below you will find all the information you need to build your own softphone. You can learn how to develop softphones on basic and advanced level, how to handle calls with the implemented softphone, how to customize the softphone GUI, etc. The various codecs and clients are also explored. The journey to softphone development is starting right ahead.

1. Softphone Development Basics

   To be able to build your own softphone in the easiest way, download and study the following basic example projects. If you are new to this technology, it is highly recommended that you start with these examples.
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2. Advanced Softphone Development

   After getting knowledge about the basics, continue your development with more professional tasks. The articles below provide you some advanced softphone projects to help you in building a reliable, feature-rich application.
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3. Sound Quality

   After studying this article, you will be fully familiar with those functionalities that intended to increase sound quality in VoIP voice and video calls.
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4. Direct calls between clients

   This article presents the basic knowledge about peer-to-peer calling. This is that case when the VoIP clients establish the connection directly without using any PBX in the connection phase.
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5. NAT traversal

   Find out all you need to know about NAT traversal and learn how to make calls through firewalls. Network Address Translation traversal is a general term for techniques that establish IP connections traversing NAT gateways.
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