ABTO SIP SDK provides a solution to quickly build VoIP softphone that can dial and receive calls on your computer or add VoIP features into your software or web website.

Our powerful and highly customizable VoIP client designed as ActiveX control and has wide range of Features: fully-customizable user interface and brand name, conference call, multiline features, ability to send text messages, dynamically loadable codec’s, DTMF support, adaptive silence detection, adaptive jitter buffer, work through firewall or NAT, and more.

Also ABTO SIP SDK is based on IETF standards (SIP, STUN, etc.) so it is compatible with standard registrars such as Asterisk, Elastix, 3CX etc.

You are welcome to download the latest full functional version of ABTO SIP SDK (with C++, C#, Delphi, VB.net, and VB6 examples), benefit from free consulting, and order application with required support period.

Please check our other solutions page to try RTP SDK (for send and receive sound by RTP protocol) and T38 Modem (for send and receive faxes using SIP protocol with existing fax applications).