"Who Else Wants to Create VoIP Applications efficiently?"

Ozeki VoIP SIP SDK will save you a lot of time. It will make you much more efficient when you build voice and video applications. You can concentrate on your project, the true functionality you want to achieve. This excellent toolbox gives you all the tools you need to create telecommunication solutions efficiently. Try it now ...

Softphone   Webphone   Callcenter, CRM, IVR
An excellent tool to build your own softphone or SIP client application

Build your own softphone
SIP voice calls
SIP video calls
SIP DTMF signaling
  Enables you to add a video phone to your website using Adobe Flash or MS Silverlight

Silverlight to SIP calls
Adobe Flash to SIP calls
Browser to browser calls
Webbrowser to VoIP calls
Javascript call management
  Can be used to add functionality to your call center, IVR or CRM

Build your own IVR
Voice recognition IVR system Voice Activation Detection Auto and predictive dialer
Call recording

Ozeki VoIP SIP SDK Product information (full datasheet)
Category Software Development Kit
Main task Makes it possible to build IP based telephone solutions, such as softphones, webphones, and VoIP client software based on the SIP protocol. Works with VoIP PBX systems and Internet based VoIP service providers.
Performance With our platform you can build telephone solutions that can serve several thousand simultaneous voice/video calls.
Connectivity It connects to a VoIP PBX or to a VoIP service provider over the Internet. Supports firewall passthrough (STUN).

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Use Ozeki VOIP SIP SDK in your .Net project and make VoIP calls immediately!

Download (.zip)  
The complete manual
Data Sheet (.pdf)
Code sample
Demo Softphone program

Facts about Ozeki VOIP SIP SDK:

1. It is a true .NET solution
All functionality of the SIP protocol is implemented in C#.NET using managed code. This is a huge advantage. Learn more...

2. Outstanding compatibility
Ozeki VoIP SDK is compatible with the following PBX systems. Check out how to configure the SDK to connect to them!

3. Supports on-line VoIP services
Ozeki VoIP SDK is fully standard complient. It works with almost all VoIP service providers. We recommend you to use the following services:

4. Outstanding support
You can expect fast reaction times and excellent service from our software developers, who are constantly improving this SDK.

5. Extended codec support
Ozeki VoIP SIP SDK has been developed to ensure excellent sound quality. For this purpose various codecs are supported effectively:

6. Customizable features and GUI
You can easily customize the features and GUI of your softphone when you use Ozeki VoIP SIP SDK. For some softphone GUI design ideas please check: Softphone GUI page!

7. It is based on IETF standards
The Ozeki VoIP SDK is implements the following standards to meet the requirements of commercial VoIP providers and PBX systems:

Read more about how various standards are used in VoIP in the Ozeki SIP Standard Overview page!