VOIP concall with the Freeswitch folk 1PM EST Mar 9

Posted on Mar 5, 2011 by Dave Täht.

The members of the Bufferbloat project are invited to sit in on Freeswitch’s regular VOIP conference call at 1PM Eastern Time, Wednesday, March 9th. Please dial into:

PSTN:       USA +1-919-386-9900 or
SIP:         sip:888@conference.freeswitch.org
GOOGLETALK: conf+888@conference.freeswitch.org

There will also be chatter on the appropriate irc channels as we attempt a melding of the minds. More details to follow.

About Freeswitch[1]

FreeSWITCH is a scalable, open source, cross-platform soft-switch that allows for consolidating various forms of communication media. It is used primarily for telephony applications - VoIP and traditional PSTN - but also supports video, chat, and other forms of communication.

FreeSWITCH was created in 2006 in response to the need for an open source, freely available telephony platform that could fill the void left by proprietary commercial offerings. Anthony Minessale is the chief architect and lead programmer on the FreeSWITCH project. He is joined by two veteran developers - Brian K West and Michael Jerris. All three of these experienced engineers spent a number of years developing for the Asterisk PBX project before starting FreeSWITCH. 

FreeSWITCH was designed with the goals of modularity, stability, and scalability. It is now used in thousands of servers to power VoIP communications for business and organizations around the world, and runs on nearly every operating system.

About the Bufferbloat project

If you are not already aware of what bufferbloat is, the fastest way to get up to speed is to peruse the slides and listen to 25 minutes of audio before the conference call, at:


It would be great to have an informed audience so we can only touch lightly on the preliminaries and then dive deeper into bufferbloat and VOIP issues. See also Jim Gettys’ blog postings[2], discussions on lwn.net[3], and slashdot[4], and elsewhere[5], as well as two very busy mailing lists[6]

In short, the bufferbloat problem is that there are really big, bloated network buffers in many (especially new) routers, home (mostly wireless) gateways, hosts, and ADSL/FIOS/cable modems that can dramatically affect VOIP performance.

The bufferbloat project[7] is attempting to identify equipment and software where truly bloated buffers exist, and mitigate or fix the issues with new software algorithms and heightened awareness. Recently we’ve released a debloat-testing Linux kernel[8] that may help in some cases. Bufferbloat is not a Linux-specific problem, it exists in all OSes, and may become more acute as Windows 7 gets rolled out.

[1] http://www.freeswitch.org/ [2] http://en.wordpress.com/tag/bufferbloat/ [3] http://lwn.net/Articles/429931/ [4] http://linux.slashdot.org/story/11/02/26/038249/Got-Buffer-Bloat [5] http://www.bufferbloat.net/projects/bloat/news [6] https://lists.bufferbloat.net/listinfo/ [7] http://www.bufferbloat.net/projects/bloat/wiki [8] http://lwn.net/Articles/429943/

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Bufferbloat Related Projects

OpenWrt Project
Congestion Control Blog
Flent Network Test Suite
The Cake shaper
CeroWrt (where it all started)

Network Performance Related Resources

Jim Gettys' Blog - The chairman of the Fjord
Toke's Blog - Karlstad University's work on bloat
Voip Users Conference - Weekly Videoconference mostly about voip
Candelatech - A wifi testing company that "gets it".