SIP SIMPLE Client SDK is a SIP multimedia endpoint development SDK from AG Projects, designed to help developers build real-time communication applications based on SIP and related protocols. It goes beyond traditional VoIP, supporting video, instant messaging, file transfer, screen sharing, and Presence, while allowing new media types to be added through an extensible high-level API.
Based on the available content, its protocol and media capabilities are quite comprehensive: it supports multiple SIP accounts, NAPTR/SRV/A DNS lookups, a non-blocking asynchronous notification engine, a configuration framework, adding or removing media via re-INVITE, and combining audio, video, IM, and other media types within the same SIP session. On the security side, it supports TLS for SIP/MSRP/XCAP, SRTP for RTP media, SDES/ZRTP key exchange, as well as mechanisms such as OTR and OpenPGP. For audio, it includes conference mixing, WAV playback and recording, echo cancellation, noise reduction, and multiple codecs; for video, it supports H.263, H.264, VP8, and VP9.
The SDK is cross-platform across Linux, Mac OSX, and Microsoft Windows, and it states that it should run with minimal changes on platforms that support C and Python development environments. Its SIP and media stack is based on PJSIP/PJMEDIA 2.10 and includes patches for advanced functionality. In terms of ecosystem, Blink SIP Client and SylkServer are useful reference projects, and it can integrate with any SIP provider, Bonjour LAN setup, or third-party P2PSIP overlay.
The software is licensed under GPL v3, making it suitable for open-source projects or teams that can accept GPL obligations. For closed-source commercial products, the content indicates that users need to contact AG Projects for an alternative license, but no public pricing, payment methods, or support SLA are provided.
Its strengths are broad standards coverage, rich media support, strong security features, and auditable open-source code. Its drawbacks are that it is relatively low-level, has a steep learning curve, and the captured content does not clearly show the quality of its quick-start materials, sample code, or API reference. It is best suited for professional communication system teams working on SIP/VoIP, enterprise communications, conferencing endpoints, Presence, and file transfer. It is less suitable for lightweight applications that only need basic WebRTC capabilities.
The available content does not provide information on Mainland China network availability, mirrors, payment options, or local support, so access is rated as unknown. Alternatives worth considering include PJSIP/PJMEDIA, WebRTC SDK, and the ecosystems around Asterisk and FreeSWITCH.
β This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on sipsimpleclient.org official site.
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