AG Projects Blink Real Time Communications Experts A state of the art, easy to use SIP client.

AG Projects BlinkReal Time Communications Experts

A state of the art, easy to use SIP client


Adrian Georgescu <[email protected]>AG Projects

• MediaProxy• CDRTool• OpenXCAP• MSRP Relay• SylkServer


Hope You all doing well. I am using pjproject 1.10 for window application. I already completed Graphical user interface, in which there is login, log out, call, end buttons. Which function I have to call for the respective buttons? --- anonymous post from Pjsip mailing list


This is the state of the SIP industry


Well made SIP servers everywhere


While the SIP clients suck big time


Ask your coworkers or friends how often they use a SIP client


Blink was born out of frustration


There must be SIP clients that do not look like a toilet seat, or grandma’s phone, must they not?


Use SIP for applications beyond VoIP


We went on this road to make a difference


Make the best SIP client in the world ;-)


This is not a task for the faint hearted individual


Real Time Communications in a client is tough stuff


There are +1200 standards related to RTC and SIP


So we took the time


Learning about what it takes


Being mentored by the best people in the industry


Going to many IETF and SIPIT events


It takes passion, not arbitrary deadlines to create perfection


Finding the right people for developing it, is key


Finding the funds for developing it, a must


It helps to have a lucrative business (AG Projects)


And generous sponsors (NLNet, FP7, AG Projects Customers)


A few years later down the road, in 2009


We have released SIP SIMPLE Client SDK


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.


Target Platforms

SIP SIMPLE Client SDK has cross platform capabilities on Linux, MacOSX, and MS Windows. The SDK can be ported with minimal changes on any platform that supports C and Python development environments.

• iOS port• Android port


Features

Written in PythonNon-blocking, asynchronous high-level middlewareTLS Security for signaling (SIP) and media (MSRP, XCAP)Multiple media type per session (Audio + IM + File Transfer)re-INVITE for adding and removing media to and from SIP sessionsConferencing, Presence, session based IM, Video (roadmap)Wide-band Internet codecs: Speex, G722Narrow-band codecs: G711, iLBC, GSM


SIP Signaling

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


Location Discovery

Next hop address resolution RFC3263 Bonjour multicast DNS draft-lee-sip-dns-sd-uri-03 Other next hop lookup mechanisms can be easily added (e.g. P2PSIP)


NAT Traversal

SIP Signaling: Symmetric Response Routing Symmetric media RFC3581RTP media (Audio and Video): Interactive Connectivity Establishment (ICE) RFC5245MSRP media (IM and File Transfers): Relay Extension RFC4976 and MSRP-ACM


Voice over IP

RTP, A Transport Protocol for Real-Time Applications RFC3550Real Time Control Protocol (RTCP) attribute in Session Description Protocol RFC3605The Secure Real-time Transport Protocol (SRTP) RFC3711Generation and parsing of telephone-events payload in both RTP and SDPMixer, Conferencing, Call Transfer


Multi-party Conferencing

Conference Event Package RFC4575A Framework for Conferencing with the SIP RFC4353SIP Call Control - Conferencing for User Agents RFC4579MSRP ad-hoc multi-party chat sessions


Instant Messaging

Common Presence and Instant Messaging (CPIM): RFC3862Session Initiation Protocol (SIP) Extension for Instant Messaging RFC3428MSRP Protocol RFC4975Indication of Message Composition for Instant Messaging RFC3994Message Summary Event Package RFC3842File Transfers RFC5547Desktop Sharing: 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 RFC4827OMA specifications for Presence and Contacts Management


SIP SIMPLE Client SDK available at http://sipsimpleclient.com


We had first Blink version for Mac, then Windows and Linux


Let's see the first Blink demo we recorded 2 years ago, the lessons we learned since then and where we are today


http://icanblink.com/movies/Blink-AudioConference.mov


Now, 2 years down the road

400 downloads per day


What have we learned?


Lesson 1. Open Source does not help much besides adoption


We thought about receiving contributions


An amazing number of ZERO contributions.

We know. Is complicated ;-)


People care for reliability, not for open source


Reliability is an intrinsic property of open source


Lesson 2. Complexity is found in unexpected places


It is roughly ten times easier to make an audio call than implementing Contacts Management and Presence

Lines of Code

Audio

Conference

Core

Presence/Contacts

Chat / File Transfer

Sum of Lines Category TotalAudio 3586Conference 2419Core 13287Presence/Contacts 15364Chat / File Transfer 3714Grand Total 38370


Lesson 3. Monetization happened in unexpected ways too!

• Alternative Licensing• Bundle with SIP services• Mac App Store


Enough talk, let’s see Blink in action today. If you like it you can buy it in the Mac App Store ;-)

• Contacts Management• Wideband audio• File Transfer• Collaborative Editor• Instant Messaging• Conferencing


http://icanblink.com/movies/Blink-ServerConference.mov


Adrian Georgescu [email protected] http://twitter.com/agprojects http://facebook.com/agprojects http://icanblink.com

AG Projects Blink Real Time Communications Experts A state of the art, easy to use SIP client.

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