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Enigma is a free Session Initiation Protocol (SIP) softphone available for your download. It can used to make Internet calls, establish conference and send instant messages to your buddies under the same SIP network. Choose your platform see features

VaxVoIP SIP Desktop SDK provides tools and components to quickly add SIP (Session Initiation Protocol) based webphone, softphone and IVR systems for Desktop OS and Mobile-Phones.

SIP DLL - A powerful and highly versatile VoIP SDK. Our SIP DLL provides a powerful and highly versatile solution to add quickly SIP (Session Initiation Protocol) based dial and receive phone calls features in your software applications.

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.

VoIP SIP SDK - A powerful and highly versatile VoIP SDK. Our SIP SDK provides a powerful and highly versatile solution to add quickly SIP (Session Initiation Protocol) based dial and receive phone calls features in your software applications.

SIP Phone DLL - A powerful and highly versatile VoIP SDK. Our SIP Phone DLL provides a powerful and highly versatile solution to add quickly SIP (Session Initiation Protocol) based dial and receive phone calls features in your software applications.

Billion PBX - программная IP-АТС с поддержкой протокола SIP для Windows и Linux. Установленный на обычный офисный компьютер, Billion PBX позволяет развернуть полноценную телефонную сеть поверх сети передачи данных.

VoIP SIP SDK - A powerful and highly versatile VoIP SDK. Our SIP SDK provides a powerful and highly versatile solution to add quickly SIP (Session Initiation Protocol) based dial and receive phone calls features in your software applications.

SIP tester is a free VoIP load testing tool which enables you to test VoIP network, SIP software or hardware. It is able to simulate thousands of simultaneous incoming and outgoing SIP calls with RTP media, analyze call quality in real time.

H.323-SIP-IAX Softphone with video and audio support for Windows Mobile 2003/5.0/6.0. Supports G.711a/u codec for audio and H.261 codec for video.