Free Sip Im Client

globaliptel. A Complete List of Open Source VoIP Software. VaxTele SIP Server SDK v. It's also completely free with no in-app purchases. A SIP App can be installed on iPhone and Android devices and help bring mobility to your business or even your residential phone service. Media Stack: The media stack depends on WebRTC (Web Real Time Communication) which is natively provided by the web browser. ICQ, shorthand for "I seek you," uses a software application, called a client, that resides on your computer. Welcome To Kamailio - The Open Source SIP Server. It allows people from around the world to have conversations together, but it can also be used for two people to chat privately. It has I believe pretty unique combination of simplicity, completeness and most of all permissive BSD-style license allowing commercial and closed-source derivatives. Mobile Attendee Check-in. That's when Mirabilis introduced ICQ, a free instant-messaging utility that anyone could use. SIP to SIP calls on a broadband internet connection are high quality, always free regardless of distance, and offer additional functionality such as free voicemail to email and phone numbers, caller ID, 3-way conference, speed dialing, call forwarding, simultaneous ring, call waiting, call return, caller ID block, and anonymous call rejection. The TextClient is an instant messaging application that can send and receive text messages over the SIP protocol. In other words, you benefit of all features that used to be provided in the past by OpenSER and SER in the same SIP server instance, plus many new features added along the years. Start now with a free trial. 16 is out, with changes being mostly cosmetic. OfficeSIP Server is designed for IM, enabling VoIP communications in SIP-compliant software and hardware clients. If these steps do not help/resolve the issue, gather a problem report from the Jabber client and contact the Cisco Technical Assistance Center (TAC). iPhone VoIP apps works wherever you have access to the internet via Wi-Fi or over 3G / 4G. Before starting, you should at least have more than one email client to be able to change between them. Free VoIP softphones and free voip applications are a great way to save money using the VoIP service you already have. Google has opened its IM service so that you can hook your own client applications into the Google Talk service, or you can connect (federate) your service with ours. Download miTester for SIP for free. I agree with all your points and really appreciate the write up, it's really good to hear an open and transparent review of the call control integration aspect of a Lync/OCS deployment. SIP SIMPLE client SDK is a Software Development Kit to create SIP end-points with features beyond VoIP like Session based Instant Messaging, File Transfers, Desktop Sharing and Presence. The SIP protocol is also used for video conferencing, instant messaging and media distribution. Setting up an Audiocodes MP-114/118 FXO with Asterisk and FreeSwitch. Instant messaging client and SIP softphone. Due to some SharePoint security regulations this had to placed on an external web site…. What would you think about having a VoIP phone that can make calls without needing an active cellular provider? Thanks to Google Voice, this is now a reality. How about setting our own chat server? Lets do it with an open-source and cross platform application called Openfire. We offer a reliable network, easy on-demand service and flexible connectivity options. In the clients of your contacts that are online, your name moves to the offline status section. 77 Released February 05, 2018 by Miranda IM Team. OTR uses a combination of the AES symmetric-key algorithm, the Diffie–Hellman key exchange, and the SHA-1 hash function. com i have seen so much change, like for instant google's gmail no offers free SMS in and out. At Jitsi, we believe every video chat should look and sound amazing, between two people or 200. This free SIP client comes with eye-catching features like free voice over IP, presence, file transfers, instant messaging and desktop sharing. Instant messaging client and SIP softphone. Main Features of the Ekiga Softphone in a nutshell Version 4. Free calls to more than 2000 VoIP networks. Finally, the major caveat to using any of these clients is that they cannot make calls to Skype users (as Skype uses an undisclosed, proprietary protocol). Desktop chat clients are far from dead. Finally, the server deletes the temporary file that contained the connection information for your client. Registration. Linkus Mobile Client is a VoIP softphone designed to give mobile functionality to Yeastar S-Series IP Phone System and Yeastar Cloud PBX. BroadSoft is the leader in cloud PBX, unified communications, team collaboration and contact center solutions for business. It's also completely free with no in-app purchases. This SIP testing tool can be used to simulate SIP call-flows & automate functional, regression tests. 0 The Free Windows Fix is an excellent solution to make your computer fast and stable as never before. After getting the VoIP download, install the app, and create an account to start your 30-day free trial. *Images of client testimonials have been changed for privacy reasons. Source, Windows binaries. Vladimír Toncar. SIP (Session Initiation Protocol) is a signaling protocol developed by the IETF Multiparty Multimedia Session Control working group. To make it simple, install the SIP server, run free OfficeSIP Messenger of Softphone and start talking! OfficeSIP Server enables voice calling in Windows Messenger, X-Lite and similar software-based open protocol SIP clients. sip client vpn express vpn for android, sip client vpn > Download Here (DashVPN)how to sip client vpn for --All Car sip client vpn Sizes-- Economy Compact Midsize Standard Fullsize Premium Luxury Mini Minivan 4 X 4 Convertible express vpn for android ★★★ sip client vpn ★★★ > Get now [SIP CLIENT VPN]how to sip client vpn for. Polycom UC Software Release Matrix for SoundPoint IP and SoundStation IP Phones. Secure video calls, conferencing, chat, desktop sharing, file transfer, support for your favorite OS, and IM network. Free USA number. It has been tested on 64bit versions of Vista to Windows 10. Whether you want to build your own massively multi-user video conference client, or use ours, all our tools are 100% free, open source, and WebRTC compatible. Bria Mobile is new and replaces the former Bria Android Smartphone Edition and Tablet Edition clients. Linphone is an open source SIP client for HD voice/video calls, 1-to-1 and group instant messaging, conference calls etc. 8 on my gateway and 1. Tox is a Free Software project whose goal is to free users from the grip of Proprietary instant messengers like Skype but with with custom designed fonts. Currently Jabber can register internally in full (IM and CUCM) using username@domain. The service is free to use based on a fair-use policy and federates with publicly reachable SIP and XMPP domains. Start ClientSetup. The purpose of a SIP client is to establish real time communications (RTC). The webphone is a self-hosted web VoIP client, shipped with life-time license, totally. But often - audio volume is low. Bria VoIP Softphone SIP Client Apps Full Version Download for PC. Get Free access to Reports, Tools and Calculators to plan your Investment effectively. XMPP is the open standard for messaging and presence XMPP powers emerging technologies like IoT , WebRTC , and social. If a SIP address is not available, a. User-friendly interface, HD audio & video, IM and more. Multimedia Service Platform and its SIP Thor variant are turnkey platforms for real-time media applications like Voice, Video, IM, File Transfer and Presence based on SIP protocol. Guest post by Benjamin Schowe A client came up with the demand for launching the Lync 2013 client applicationfrom his SharePoint 2013 intranet web site - with any browser. 16 is out, with changes being mostly cosmetic. Set Default Email Client. Mix - Tory Lanez - I Sip (Audio) YouTube 50+ videos Play all Hip Hop and R&B Hotlist YouTube Tory Lanez - To D. - Shows personal call log/history. See the individual. The server sends a message to the client of each person on your contact list who is currently online to indicate that you have logged off. XMPP differs from other IM applications as it is immensly extendable. Follow us on Twitter and blog. Most offices are using a single Internet uplink to connect with the world. Success, and your mileage will vary. If you want to use Pidgin, you should either download and use our Windows installer or look for pre-built packages from your operating system distribution. [3428] SIP Extension for Instant Messaging [3856] A Presence Event Package for SIP [3903] SIP Extension for Event State Publication [4235] An INVITE-Initiated Dialog Event Package for SIP [3515] SIP Refer Method [5626] Managing Client-Initiated Connections in SIP (SIP Outbound) [5954] Essential Correction for IPv6 ABNF and URI Comparison in RFC. The tool is cross-platform, and should work on Windows and major POSIX systems. SIP trunking also has a number of technological advantages: More communications options. Due to some SharePoint security regulations this had to placed on an external web site…. PortSIP Softphone, a SIP standards VoIP client for unified communication which built based on PortSIP VoIP SDK, provides enterprises and personal with a seamless communications experience across any device, network or platform. I would like to someone to come back and say "We use _____, and it works great. sipML5 should work on any web browser supporting WebRTC but we highly recommend using Google Chrome or Firefox Nightly for testing. 2016-09-22T15:17:35Z Comment by Allison Shapira. I reviewed a few free clients to see which worked the best. Select your mobile operating system to download VoIPstudio. The free version also comes in. The project is developed with eMbedded Visual C++ as "Dialog based application". SIP providers also frequently offer better rates on international calls than traditional phone service providers, and most importantly, intra-office calls and calls between branch offices are frequently free when connected via SIP trunking. Ease of use with a modern Graphical User Interface Audio and Video free calls through the internet Free Instant Messaging through the internet with Presence support Audio (and video) calls to landlines and cell phones with support to the cheapest service providers. 01501584 Registered Office: Rutland House, 8th Floor, 148 Edmund Street, Birmingham, B3 2JR VAT No. MicroSIP is a portable SIP softphone based on the PJSIP stack available for Microsoft Windows operating systems. Below you will find six best free instant messaging program clients for Windows, Mac OS X and Linux. Craigs Investment Partners Limited is a NZX Participant firm. At Tivi, we develop software and provide telecommunications services. Try It Free Contact Sales. I agree with all your points and really appreciate the write up, it's really good to hear an open and transparent review of the call control integration aspect of a Lync/OCS deployment. The IM protocol is based on SIMPLE(IETF) working group's specification. [3428] SIP Extension for Instant Messaging [3856] A Presence Event Package for SIP [3903] SIP Extension for Event State Publication [4235] An INVITE-Initiated Dialog Event Package for SIP [3515] SIP Refer Method [5626] Managing Client-Initiated Connections in SIP (SIP Outbound) [5954] Essential Correction for IPv6 ABNF and URI Comparison in RFC. I've looked too, and I have not found any that have SMS-enabled numbers that use SIP MESSAGE to send the text to you. Schools with Asterisk v. net) without this is not able to Register. Stay connected wherever you go – start or join a 100-person meeting with crystal-clear, face-to-face video, high quality screen sharing, and instant messaging – for free! Award winning Zoom brings video conferencing, online meetings and group messaging into one easy-to-use application. This is a one stop guide when deciding which voip software best fit your requirement. All this, and more, in Jitsi Desktop – the most complete and advanced open source communicator. It has been tested on 64bit versions of Vista to Windows 10. Psi is a multi-platform and standards-based instant messaging client available for Windows, Linux, Mac and more. My explaination is that SIP is an open standard for VoIP Session Initiation Protocol - Wikipedia, the free encyclopedia compared to Skype and Viber these are proprietary and closed VoIP systems. No painting experience required! Book into a public paint session or book a private party. A free, stable, secure and feature-rich Jabber/XMPP server. The 3CX VoIP Phone is a free softphone client available for Windows. We tried to build the best Jabber (XMPP) client based on all previous experience for both Windows and mobile platforms (iOS, Android, Windows Phone) that more and more people use. The project is developed with eMbedded Visual C++ as "Dialog based application". 0 VaxTele SIP Server SDK (Software Development Kit) is a new and flexible approach to develop SIP based VoIP servers, IP-PBX, SIP gateways, SIP PBX. Start ClientSetup. The application has been designed with attention to detail, brand new UI that is easy to use and stays out of your way, so you can focus on what matters the most – the calls. Sippet is an open-source SIP User-Agent library, compliant with the IETF RFC 3261 specification. How to install minecraft hack clients for free! Hey guys whats up its Pandahz! Today im going to be showing you how to get free minecraft hack clients!. IM or Instant Messaging is simple text communication between two people (or more people) using computers or other devices at the same time, along with shared clients. Systematic Investing in a Mutual Fund is the answer to preventing the pitfalls of equity investment and still enjoying the high returns. Satisfactory Coffee Stain Studios 29,95 $ The Sinking City Bigben Interactive. A state of the art, easy to use SIP client Blink is the best real-time communications client using the SIP protocol. Search forums it is not getting passed along to the SIP client (IP Phone). The VoipSwitch main package includes a class 5 softswitch with integrated billing and a VoipSwitch user portal. 19 hours ago · The Mobile SIP dialer is a mobile application which uses different SIP protocols for communication purpose. Guidepoint connects clients with vetted subject matter experts—Advisors—from our global professional network. To make and receive voip calls. Pay as you Go VoIP service with No Monthly Fees and No Term Contract. Im Epic Games Store suchen. VoIP and messaging on the Ubuntu desktop. SIP2SIP is a real time communications service for audio, video, presence, chat, file transfer and multiparty conferencing based on WebRTC, SIP, XMPP and related protocols. Powered by MyConnection Server, whether a 1Mbps or 100Gbps connection, measurement accuracy not only discovers problems, it also provides the essential information to help find and resolve the problem. I will forever try and use this and recommend it to all clients. It is highly recommended that users upgrade to take advantage of the latest changes. org XMPP Server Mobile friendly and open source Fifteen years of the IM tradition Committed to standards - support many modern features (http file upload, rtc, sip, stun, push notifications, anti SPAM/SPIM protection etc). client synonyms, client pronunciation, client translation, English dictionary definition of client. mobile presence and instant messaging clients, which also include Cisco Jabber SDK. The free enterprise instant messenger offers businesses advanced video chat capabilities with easy installation and zero-hassle NAT/firewall traversal. I'm going to recommend it to my clients! 2016-07-15T14:09:03Z Comment by Jason. Blink is a simple free SIP client that works with Windows, Linux and Mac. I have a "relatively slow" Internet connection, and Outlook would fall over repeatedly, timing out, regardless of how I configured it. Cross-platform real-time collaboration client optimized for business and organizations. The AT&T Global Network Client provides your business with a single solution for remote access from computers/smartphones/tablets, or Local Area Networks (LAN) to corporate IP VPN’s, intranets and extranet(s), as well as the public Internet. 10 best Android apps for VoIP and SIP calls. Part 3 is dedicated to the sip:provider Platform acting as an SBC in front of existing VoIP systems. Trillian is a multi protocol instant messaging application for Windows created by Cerulean Studios that can connect to multiple IM programs from one client,… Download & More TweetDeck. A Free SIP Account for Any Device. OfficeSIP Messenger - Free IM Client for Office / Enterprises August 15, 2009 by chatmania If you noticed early on this blog, you must be knew that there are at least two article discussing about Instant Messenger Client for Enterprises or Businesses. For residential markets, voice over IP phone service is often cheaper than traditional public switched telephone network (PSTN) service and can remove geographic restrictions to telephone numbers, e. communigate. voicemail capabilities, and IM. hu) as a voip client, and the configuration is very obvious, as it should be with other softphones too. OfficeSIP Softphone and Messenger are two enterprise VoIP SIP clients written in C# in. In other words, you benefit of all features that used to be provided in the past by OpenSER and SER in the same SIP server instance, plus many new features added along the years. Click here to learn more about VoIPVoIP mobile voip services. sip client free download - RealTunnel Client for SIP, Adore SIP Client, iPhone SIP Client, and many more programs. Here is the most comprehensive list of Free or Open source Softwares for VoIP. CSIP Simple is a free SIP client for the Android OS. If these steps do not help/resolve the issue, gather a problem report from the Jabber client and contact the Cisco Technical Assistance Center (TAC). sip voip client server free download - mini SIP Server (20 clients), mini SIP Server (50 clients), Join softphone - VoIP SIP client, and many more programs. Plivo's SMS API Platform and Voice API Platform enables businesses to communicate with their customers at global scale. Best XMPP clients for Windows Instant Messaging and Presence XEP-0012 Last Activity XEP-0016 Privact over 2. These channels are on IRC servers, which you can connect to by finding that server's information. org for more info. All this, and more, in Jitsi Desktop – the most complete and advanced open source communicator. OTR is the messaging encryption protocol with a high level of security and privacy. Single log-on allows softphone users signing in to a SIP server without having to enter a password. The VoipSwitch main package includes a class 5 softswitch with integrated billing and a VoipSwitch user portal. XMPP is an open standard for instant messaging and real-time communication. Slipstick Systems On a client computer that is running Office Do you have any IM utilities installed or running. ps I was wondering why the App is free and not the desktop. I have an Asterisk PBX under development, that I would like to link to a Skype account if possible. Calling from an Outlook Contact does not work. Download ClientSetup. Conversations inside “Teams” tab (Team Conversations) are not using Skype for Business, but conversations in “Chat” tab (1 to 1 Instant message) might be if the user you want to chat to is not already using Microsoft Teams but is in your Office 365 tenant. Setting up an Audiocodes MP-114/118 FXO with Asterisk and FreeSwitch. Before we describe the flow of a typical SIP call, let's have a look at how SIP user agents register with a SIP registrar. 77 Released February 05, 2018 by Miranda IM Team. Like other multi-protocol IM clients, SIP Communicator supports the popular protocols like Jabber, AIM, ICQ, MSN and Yahoo! Messenger. Linkus Mobile Client is a VoIP softphone designed to give mobile functionality to Yeastar S-Series IP Phone System and Yeastar Cloud PBX. Communication downloads - 3CX VoIP Client by 3CX System Ltd and many more programs are available for instant and free download. OnSIP comes with a free softphone application for mobile and dekstop. Awesome SIP client. All this, and more, in Jitsi Desktop – the most complete and advanced open source communicator. com MyVoipProvider. 264-capable SIP video client. To log in, use an IM client like Adium, ChatSecure, Conversations, Gajim, Jitsi, Messages, Pidgin, Psi, or Swift (a full list is here). A free, stable, secure and feature-rich Jabber/XMPP server. Click here to learn more about VoIPVoIP mobile voip services. it gets registered on the SIP server and then let the authentic caller makes calls. If Karta is not an existing client, please open first Karta’s account and then add HUF in his account. Deluge is a lightweight, Free Software, cross-platform BitTorrent client. The project is developed with eMbedded Visual C++ as "Dialog based application". As the host, you can start the meeting from the Zoom desktop client for Mac, PC or Linux, the Zoom app for Android or iOS, your web browser, or an H. Endpoints that work: Jitsi - Jitsi works well for both H. IceChat is a popular IRC (Internet Relay Chat) Client that can be used in Windows Vista upto and including Windows 10. Repeat! A test of both endurance and gastro-intestinal fortitude, the STUFF YOUR FACE RACE 5K/10K/Relay benefiting IMPOWER is like no other in Central Florida! Build a team or take on the challenge yourself to eat-and-run your way to the finish line. Guest post by Benjamin Schowe A client came up with the demand for launching the Lync 2013 client applicationfrom his SharePoint 2013 intranet web site - with any browser. It can register to any SIP VoIP provider or IP/SIP capable PBX using a WiFi connection in office, campus, home, hotel rooms, public hot-spots etc. IANA Registration Instant Messaging and Presence DNS SRV RRs for SIP: RFC 5552: SIP Interface to VoiceXML Media Services: RFC 5589: SIP Call Control - Transfer: RFC 5621: Message Body Handling in SIP: RFC 5626: Managing Client-Initiated Connections in SIP: RFC 5627: Obtaining and Using Globally Routable User Agent URIs (GRUUs) in SIP: RFC 5628. Like other multi-protocol IM clients, SIP Communicator supports the popular protocols like Jabber, AIM, ICQ, MSN and Yahoo! Messenger. Member of the London Stock Exchange. Adore Softphone provides best softphones,sip softphone, pc phone software,instant messeging, webdialers, and click to talk softwares To get free demo of Adore Mobile & PC Dialer, Please Fill up the form. Session Initiation Protocol (SIP) is the most common communications protocol used for IP-based multimedia communication sessions, such as voice and video calls. US has developed our trunking service to be compatible with a variety of free, open source, call control and unified communications solutions including 3CX. Unified Communications - Comparing Cisco and Microsoft Solutions and Presence - Jabber is Cisco’s instant messaging client which in addition to providing “chat a SIP service from a. CommuniGate. Ease of use with a modern Graphical User Interface Audio and Video free calls through the internet Free Instant Messaging through the internet with Presence support Audio (and video) calls to landlines and cell phones with support to the cheapest service providers. eBuddy has been around for a while, but has become a rage in the past few months thanks to its famous iPhone client. Blink is a simple free SIP client that works with Windows, Linux and Mac. ps I was wondering why the App is free and not the desktop. I use mizuphone (from mizutech. IM/Presence. Finally, the major caveat to using any of these clients is that they cannot make calls to Skype users (as Skype uses an undisclosed, proprietary protocol). µTox is the lightweight client with minimal dependencies; it not only looks pretty, it runs fast! µTox is available for Windows, OS X, and Linux (Android support is experimental), with full support for chat, file transfers, audio/video calling, and desktop sharing (both as video and inline screenshots). Often you can barely hear the person on the other side when you are in a somewhat noisy environment. exe Offline installation, includes Java JRE (recommended) January 29, 2017 75. Microsoft Skype for Business with an Office 365 subscription is the latest version of Skype for Business. XMPP (Jabber) is an XML based protocol primarily for presence and messaging. Chat Online with an Expert. Send instant messages from the Skype app from your desktop or other devices. Our clients leverage the insights and perspectives shared by our Advisors to stay informed and make better business decisions. also you can get additional out mins and make it a portable sms in and out client pretty coool. SIP2SIP is a real time communications service for audio, video, presence, chat, file transfer and multiparty conferencing based on WebRTC, SIP, XMPP and related protocols. A SIP App can be installed on iPhone and Android devices and help bring mobility to your business or even your residential phone service. This is the best client in terms of voice quality. Mobile Attendee Check-in • 24/7 help via email: support@etouches. The desktop client provides a richer user experience and additional features that are outlined in Section 3. This download is for the source code of Pidgin 2. iPhone VoIP apps works wherever you have access to the internet via Wi-Fi or over 3G / 4G. OnSIP comes with a free softphone application for mobile and dekstop. Plivo's SMS API Platform and Voice API Platform enables businesses to communicate with their customers at global scale. Jitsi is cross-platform, free and open-source software client that supports Instant Messaging (IM), voice and video chat over the internet. 0 Project SWA (Schools with Asterisk) is a program for schools, which uses a Asterisk PBX and a SIP client based on SIP Communicator, but with re-made GUI for teacher-student conferencing, and in the future maybe more advanced features. VoIP/SIP client (softphone) for Windows. Available for iOS, Android, Windows, macOS and GNU/Linux. There are many reliable Email clients, some popular ones include, Outlook, Postbox and Thunderbird. No Connection or Activation Fees, No Taxes, No Hidden Charges. The following versions: 4. Skip trial 1 month free. Instant messaging client and SIP softphone. iPad SIP client app enables customers to make free phone calls to other VoIPVoIP users or very cheap phone calls to anyone else in the world from your iPad using bluetooth headset. Conversations inside “Teams” tab (Team Conversations) are not using Skype for Business, but conversations in “Chat” tab (1 to 1 Instant message) might be if the user you want to chat to is not already using Microsoft Teams but is in your Office 365 tenant. Getting your team together is as easy as sharing a link. ©2019 - Sip & Purr - Milwaukee's Very First Cat Cafe - EAT. The platform is based on IETF standards that integrate the best open source software related components available on the market. You can have an IM conversation with one or many people, send pictures and files or add audio or video. This is the best client in terms of voice quality. In the clients of your contacts that are online, your name moves to the offline status section. SIP is changing the way people communicate using the Internet. As mentioned before, instant messaging applications are SIP clients that can be used to send out voice and video messages free of charge. Swift's clean design and comprehensive feature set make it the logical choice for anyone looking for a cross-platform XMPP client. I reviewed a few free clients to see which worked the best. If you are looking to modify Pidgin, you may want to look at our instructions for checking out the code from our repository. When looking for a SIP and media stack I've spotted libre/librem/baresip from creytiv. 10 best Android apps for VoIP and SIP calls. AG Projects offers this free SIP service as one way for users to test the features present in its products. com - FWD Comuunicator. There are numerous Jabber servers open to the public, which can. You can use it with many SIP providers, on the LAN using Bonjour and with SIP2SIP, a free service. SIP providers also frequently offer better rates on international calls than traditional phone service providers, and most importantly, intra-office calls and calls between branch offices are frequently free when connected via SIP trunking. Endpoints that work: Jitsi - Jitsi works well for both H. Home; Registration Need SIP account? Expert mode? Video enabled Call control Call. qTox is a free and open source p2p instant messaging, audio and video calls app and is (apparently) the most feature-rich Tox client. As the host, you can start the meeting from the Zoom desktop client for Mac, PC or Linux, the Zoom app for Android or iOS, your web browser, or an H. Top Contracts Choose from more than 80 insurance carriers nationwide to ensure you’re offering the plans that meet your clients’ unique needs. Cloud Audio Recorder is a fun, simple and easy to use audio & voice recorder. Zoiper IAX & SIP multilanguage and multiplatform (Windows, Linux and Mac OS X) softphone is a VoIP soft client, meant to work with any IP-based communications systems and infrastructure. I reviewed a few free clients to see which worked the best. Lync 2013 is the full-featured client for Lync Server. It is not only about making phone calls over the Net. Welcome to OpenVoIP, an open source peer-to-peer VoIP and IM system of ~1000 nodes running on ~300 PlanetLab machines. Free Sip Im Client.