VoIP SIP SDK provides a powerful and highly customizable solution to quickly add SIP based dial and receive phone calls features in your software applications. It accelerates the development of SIP VOIP applications.

Features: VoIP SIP SDK provides a toolkit to create SIP based phone solutions to your applications. This toolkit should expedite development time easily. SIP based soft-phone with customized interface and branding is possible. The SDK has quickly loadable codecs, registrar support, hold/retrieve calls, forward calls, transfer calls features. It also has mute sound, play WAV file into a conversation, record the conversation features as well. DTNF dialing, adaptive silence detection,. VPN support, authorization Id, adaptive jitter buffer and so on are additional features that can be supported on the soft-phones being developed. Code samples are provided on Delphi, C#, VB.Net and HTML.

This SDK is based on IETF standards such as SIP, STUN etc. It delivers clear voice quality and is conferencing capable. Echo cancellation has been implemented. It will work easily with other standards compatible devices such as Asterisk and OpenSER etc. valid ActiveX components are created. There`s a set of codecs that are supported and are loadable . These include G.711-ALaw, G.711-uLaw, G.726 (16k 24k 32k 40k), G.729, G.729A, iLBC, LPC-10, Speex (Narrow, Wide) and G 723.1. The kit is royalty free and there are no yearly or monthly fees.

Overall: A SDK that covers most of the features that may be required to develop a SIP based soft-phone application. It is easy to use but you must have the required development skills of course!