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Adrian Georgescu Founder and CEO of AG Projects Advocate of IETF standards (Internet Standards) PowerPoint PPT Presentation

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Adrian Georgescu Founder and CEO of AG Projects Advocate of IETF standards (Internet Standards) Co-chair the Dutch ISOC SIP Special Interest Group Treasurer of OpenSIPS Software Foundation http:// SIP SIMPLE Client SDK.

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Adrian Georgescu Founder and CEO of AG Projects Advocate of IETF standards (Internet Standards)

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Adrian Georgescu

Founder and CEO of AG Projects

Advocate of IETF standards (Internet Standards)

Co-chair the Dutch ISOC SIP Special Interest Group

Treasurer of OpenSIPS Software Foundation


The project started with my dream to create an easy to use Real Time Communications software library

Based on Open Standards related to SIP protocol

SIP protocol

SIP stands for 'Session Initiation Protocol', an IETF standard described by RFC 3261.

SIP is an Internet application-layer control protocol that can establish, modify and terminate multimedia sessions such as Internet telephony calls (VoIP). Media can be added to (and removed from) an existing session.

SIP is not for just for plain telephony replacement but also for other desirable forms of communication:

HD Audio, Video, Instant Messaging and Desktop Sharing.

SIP is a future-proof protocol, think about email and www

I knew it was a difficult task

There are +1200 related standards today

Most of all relevant Internet technologies are embedded into a real-time communication software

Many have tried and many have failed to provide a future-proof solution

Those who have tried and succeeded are walled-garden silos, they do not interoperate and are not using Open Standards

What does one need to create a compelling end-user experience for a SIP application?

First, it has to work!

For a SIP client to work, it needs good SIP server support with all relevant features

I started from my initial goal in 2003

Building SIP servers

One learns a lot from building SIP servers, understands how SIP clients should behave

In 2008, we finished building several relevant SIP server components in use by many operators today

OpenSIPS - SIP Proxy/Registrar/Presence Agent

MediaProxy - Relay for RTP media

MSRPRelay - Relay for MSRP media

OpenXCAP - Policy server for Presence

CDRTool - Accounting and Mediation

We have created in this process what is AG Projects core business today, selling turnkey SIP infrastructure

We gained the necessary experience required for building the SIP client

With this experience, we secured the necessary funding from an EU project in late 2007

We started building the foundation for a generic SIP client in early 2008.

We are now 90% done after 2 years of development



SIP SIMPLE client SDK is a Software Development Kit for development of Real Time Applications based on SIP and related protocols for media transport like Presence, Audio and Instant Messaging (IM). Other media types can be easily added by using an extensible high-level API.

The software has undergone in the past years several interoperability tests at  SIPIT and today is of industry strength quality.


The library has cross platform capabilities on Linux OS, Mac OSX, Microsoft Windows is on the roadmap.

The library should work with minimal changes on any platform that supports C and Python development environments.

Generic Features

Written in Python Programming Language

Non-blocking and Asynchronous

High Level Middleware with Configuration Framework

TLS Security for signaling (SIP) and media (MSRP, XCAP)

Multiple Media Types per Session (e.g. Audio + IM)

Trace capability for all underlying protocols

Supports re-INVITE for adding and removing media

Audio Conference Bridge

Wav Player and Recorder

Acoustic Echo Cancelation

Answering Machine with take over support

Wide-band Internet codecs: Speex and G722

PSTN compatible codecs: G711, iLBC, GSM

SIP Signaling

Session Initiation Protocol RFC3261

Session Description Protocol RFC4566

An Offer/Answer Model with Session Description Protocol (SDP) RFC4566

Location Discovery

RFC3263 next hop resolution lookup

Bonjour multicast DNS (work in progress

NAT Traversal

SIP Signaling: Symmetric Response Routing Symmetric media RFC3581

RTP media (Audio and Video): Interactive Connectivity Establishment (ICE) draft-ietf-mmusic-ice-19

MSRP media (Instant Messaging and File Transfers): MSRP Protocol Relay Extension RFC4976

Voice and Video over IP

RTP, A Transport Protocol for Real-Time Applications RFC3550

Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP) RFC3605

The Secure Real-time Transport Protocol (SRTP) RFC3711

Generation and parsing of RFC 2833/telephone-events payload in both RTP and SDP RFC283

Multi-party Conferencing

Conference Event Package RFC4575

A Framework for Conferencing with the Session Initiation Protocol RFC4353 (work in progress)

SIP Call Control - Conferencing for User Agents RFC4579 (work in progress)

MSRP ad-hoc multi-party chat sessions draft-ietf-simple-chat-05 (work in progress)

Instant Messaging

Common Presence and Instant Messaging (CPIM): RFC 3862

Session Initiation Protocol (SIP) Extension for Instant Messaging RFC3428

MSRP Protocol RFC4975

Indication of Message Composition for Instant Messaging RFC3994

Message Summary Event Package RFC3842

File Transfer RFC5547

Desktop Sharing: Variation of draft-garcia-mmusic-sdp-collaboration-00 using RFB over MSRP


SIP Specific Event Notification RFC3265

SIP Extension for Event State Publication RFC3903

Presence Data Model (PIDF) RFC3863, RFC3379, RFC4479

Watcher-info Event Package RFC3857, RFC3858

Rich Presence Extensions to PIDF RFC4480

Contact Information Extension to PIDF RFC4482

User Agent Capability Extension to PIDF RFC5196

XCAP Protocol RFC4825

Common Policy RFC4745

Presence Rules RFC5025

Resource Lists RFC4826

RLS Services RFC4826

PIDF manipulation RFC4827

Having the foundation in place, we went back to the design a Graphical User Interface SIP client

We secured the funding from AG Projects and NLNet Foundation

The key was simplicity and desirability

My father should be able to use it

My wife should find pleasure in using it

My son should be proud his father did it

Welcome to Blink!

My name is Adrian Georgescu

[email protected]

Twitter: agprojects

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