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

AG Projects SIP SIMPLE client SDK The SIP Infrastructure Experts

Adrian Georgescu

Founder and CEO of AG ProjectsAdvocate of IETF standards (Internet Standards)Co-chair the Dutch ISOC SIP Special Interest GroupTreasurer of OpenSIPS Software Foundation http://opensips.org


SIP SIMPLE Client SDK


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 AgentMediaProxy - Relay for RTP mediaMSRPRelay - Relay for MSRP mediaOpenXCAP - Policy server for PresenceCDRTool - 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 SDKhttp://SipSimpleClient.com


SIP SIMPLE client SDK

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.


SIP SIMPLE client SDK

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 LanguageNon-blocking and AsynchronousHigh Level Middleware with Configuration FrameworkTLS Security for signaling (SIP) and media (MSRP, XCAP)Multiple Media Types per Session (e.g. Audio + IM)Trace capability for all underlying protocolsSupports re-INVITE for adding and removing mediaAudio Conference BridgeWav Player and RecorderAcoustic Echo CancelationAnswering Machine with take over supportWide-band Internet codecs: Speex and G722PSTN compatible codecs: G711, iLBC, GSM


SIP Signaling

Session Initiation Protocol RFC3261Session Description Protocol RFC4566An Offer/Answer Model with Session Description Protocol (SDP) RFC4566


Location Discovery

RFC3263 next hop resolution lookupBonjour multicast DNS http://tools.ietf.org/html/draft-lee-sip-dns-sd-uri-03 (work in progress


NAT Traversal

SIP Signaling: Symmetric Response Routing Symmetric media RFC3581RTP media (Audio and Video): Interactive Connectivity Establishment (ICE) draft-ietf-mmusic-ice-19MSRP media (Instant Messaging and File Transfers): MSRP Protocol Relay Extension RFC4976


Voice and Video over IP

RTP, A Transport Protocol for Real-Time Applications RFC3550Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP) RFC3605The Secure Real-time Transport Protocol (SRTP) RFC3711Generation and parsing of RFC 2833/telephone-events payload in both RTP and SDP RFC283


Multi-party Conferencing

Conference Event Package RFC4575A 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 3862Session Initiation Protocol (SIP) Extension for Instant Messaging RFC3428MSRP Protocol RFC4975Indication of Message Composition for Instant Messaging RFC3994Message Summary Event Package RFC3842File Transfer RFC5547Desktop Sharing: Variation of draft-garcia-mmusic-sdp-collaboration-00 using RFB over MSRP


Presence

SIP Specific Event Notification RFC3265SIP Extension for Event State Publication RFC3903Presence Data Model (PIDF) RFC3863, RFC3379, RFC4479Watcher-info Event Package RFC3857, RFC3858Rich Presence Extensions to PIDF RFC4480Contact Information Extension to PIDF RFC4482User Agent Capability Extension to PIDF RFC5196XCAP Protocol RFC4825Common Policy RFC4745Presence Rules RFC5025Resource Lists RFC4826RLS Services RFC4826PIDF 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!


http://SipSimpleClient.comhttp://iCanBlink.com

My name is Adrian [email protected]: agprojects

mailto:[email protected]

mailto:[email protected]

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

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