AG Projects

CDRTool

AG Projects — Thu, 28 May 2026 07:00:00 GMT

CDRTool is an Open Source solution that provides mediation, accounting and tracing for Call Detail Records enerated by OpenSIPS by using RADIUS protocol and OpenSIPS siptrace facility.

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End-points

AG Projects — Thu, 28 May 2026 07:00:00 GMT

We build, deploy and support SIP and WebRTC end-points for various operating systems, since 2007.

SIP allows the endpoints to negotiate and combine any type of session they mutually understand like Audio, Video, Instant Messaging (IM), File Transfer, Desktop Sharing and provides a generic event notification system with real-time Publications and Subscriptions about state changes that can be used for asynchronous services like Presence, Message Waiting Indicator and Busy Line Appearance.

WebRTC leverages the power of SIP to both mobile and desktop environments and augment it with new features like multi-party video conferencing.

Infrastructure

AG Projects — Thu, 28 May 2026 07:00:00 GMT

MediaProxy

AG Projects — Thu, 28 May 2026 07:00:00 GMT

MediaProxy is a media relay for RTP/RTCP and UDP streams that works in tandem with OpenSIPs to provide NAT traversal capability for media streams from SIP user agents located behind NAT.

SIP SIMPLE Client SDK 5.4.0 released

AG Projects — Thu, 28 May 2026 07:00:00 GMT

SIP SIMPLE Client SDK version 5.4.0 has been released.

This version delivers interoperability with audio and video WebRTC end-points, and zRTP key negotiation with Sylk Suite.

Full release notes and discussion are available in the announcement on the SIP Beyond VoIP mailing list: May 2026 announcement.

Sylk Suite

AG Projects — Thu, 28 May 2026 07:00:00 GMT

Sylk Suite is a set of applications that act both as infrastructure and end-points to provide advanced real-time media services that mirror functionality available from commercial vendors (WhatsApp and Telegram). The differentiation is in the use of open standards and the availability of source code.

Sylk Suite is open-source software available in binary format and as source code. Using Sylk Suite you can build your own real-time communications infrastructure on the operating system of your choice and under your own Internet domain for web, mobile and desktop clients.

Platform components:

SIP/WebRTC application server
Mobile push notifications server
Desktop client for Windows, Linux and MacOS
Web page compatible with WebRTC enabled browsers
Client development SDK

The platform supports one-to-one audio/video and multiparty audio/video, screen-sharing, file transfers and text chat media, with end-to-end encryption for all media.

The application server is SIP compliant and requires a SIP server to operate. The client application is written in JavaScript, using React Native for mobile and Electron for desktop. The backend application server is written in Python. The push notifications server is compatible with Apple and Google (Firebase).

Sylk Suite installer

The platform is horizontally scalable using SIP Thor.

The server supports SIP and XMPP signaling, mobile push notifications, end-to-end encrypted text messaging with offline storage, RTP, MSRP and WebRTC media planes, has built-in capabilities for creating multiparty conferences with wideband Audio, IM and File Transfers, and can be easily extended with other custom applications using the Python language.

For purchasing inquiries go to Purchasing page.

Features

SIP Signaling

TLS, TCP and UDP
INVITE and REFER
SUBSCRIBE and NOTIFY
DNS and Bonjour

Voice Over IP

Wideband (Opus, G722)
Narrowband (G711)
Encryption (SDES and ZRTP)
NAT Traversal (ICE)

Messaging

Sessions based chat (MSRP)
SIP Messages
Offline storage
Encryption (OpenPGP)
Is-Composing Indication
End-to-end delivery notifications

SIP conferencing

Participants list
VoIP and IM
File Transfers
Screen-sharing

Gateway

SIP to XMPP
SIP to WebRTC
SIP to IRC
Push notifications

Web conferencing

WebRTC audio/video
File-sharing
Screen-sharing
Chat

Full documentation and source code at sylkserver.com.

zRTP end-to-end encryption in Sylk Suite

AG Projects — Thu, 28 May 2026 07:00:00 GMT

AG Projects has rolled out zRTP end-to-end encryption across its Sylk Suite stack. The implementation is cross-platform and supported by the SIP SIMPLE client SDK, the Blink SIP client, and the Sylk Mobile and Web clients.

On WebRTC clients (mobile and browser) the implementation relies on the Insertable Streams technique. Insertable Streams expose encoded media frames to JavaScript before they hit the network, allowing zRTP-derived keys to be applied end-to-end on top of the hop-by-hop SRTP that the WebRTC stack already provides — so audio and video stay encrypted all the way between peers, even when traffic traverses SylkServer or a TURN relay.

Implementation details, key-exchange flow and verification UX are documented in the Sylk Mobile repository: github.com/AGProjects/sylk-mobile/tree/master/docs/encryption.

OpenSIPS Summit 2026 in Bucharest

AG Projects — Wed, 29 Apr 2026 08:00:00 GMT

OpenSIPS Summit 2026 in Bucharest

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OpenSIPS Summit 2025 in Amsterdam

AG Projects — Wed, 14 May 2025 08:00:00 GMT

OpenSIPS Summit 2025 in Amsterdam

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Astricon 2025 in Fort Lauderdale

AG Projects — Mon, 17 Feb 2025 13:29:35 GMT

SIP Clients and Beyond, a presentation about status of open source SIP clients available in the public domain.. or all about SDP sinners and the ultimate answer for the question why so many Romanians are involved in the VoIP industry.

https://www.asterisk.org/astricon-2025/

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