[Freeswitch-dev] Scalabilty of Freeswitch

Shelby Ramsey sramsey at sipinterchange.com
Thu Aug 27 14:31:05 PDT 2009 

Jerry,

Our responses did not conflict at all (although Ken is definitely a more 
reliable resource on the topic than myself). 

To answer your question(s) (I think):
        -- The media modes really dictate how much traffic you can run 
through an instance
        -- If you select bypass media you can only control the signaling 
... things like voicemail, etc would be managed by the devices you are 
signaling to (i.e. other FS instances).  

Most everyone who runs lots of traffic through FS clusters the devices.  
These clusters are independent FS instances that have no knowledge of 
one another.  There are lots of ways to build your application so that 
they look like one (event_socket, xml_curl, custom mods) .... but FS 
itself won't take care of keeping the state from all of the devices in 
the cluster (nor will one instance tell another instance to eavesdrop on 
a call).  It's actually pretty easy to build your own (thanks to the 
smarts these fine folks used when writing this thing).

OpenSER(or any of the other forks of the project) is a great mechanism 
to load balance to the cluster or you could do networking tricks like 
round robin DNS.

If you really wanted to dig into this I'd post what you are trying to 
accomplish on the list (general -- not dev) or if there are commercial 
concerns you could always engage the core developers in evaluating -- 
consulting at freeswitch.org.

SDR


Jerry Richards wrote:
> Okay.  I got two replies from Shelby R. and Ken R.  I presume these 
> two answers do not conflict?  I gather from these replies is that FS 
> has 3 modes: 1) FS is a complete stand-alone system (i.e. FS interacts 
> with media stream), 2) FS is a media_proxy (i.e. FS simply 
> receives/transmits media but does not process it), 3) FS is in bypass 
> media mode where FS tells both endpoints to send media directly to 
> each other (i.e. no media handling packet handling at all).
>  
> In mode 3), How do the IVR, Voice Mail, Eavesdropping, MOH and central 
> conferencing features work?  Would it use an external media server(s)?
>  
> Also, Ken you mentioned "clusters".  What is a cluster?  What 
> system(s) are you running the 20K concurrent calls at 2000 calls/sec 
> rate?  Which of the three modes are you running the server when 
> recording these statistics?
>  
> Thanks and Best Regards,
> Jerry
>
>     ------------------------------------------------------------------------
>     *From:* Ken Rice [mailto:krice at freeswitch.org]
>     *Sent:* Thursday, August 27, 2009 9:31 AM
>     *To:* freeswitch-dev at lists.freeswitch.org
>     *Subject:* Re: [Freeswitch-dev] Scalabilty of Freeswitch
>
>     It is possible to do such a think via a number of mechanisms.
>     Remember FS can operate in 3 modes, standard mode where we can do
>     transcoding and interact with the media stream, or proxy_media
>     mode where we just proxy the media packet in packet out, and
>     bypass_media mode where we tell the end points to send the media
>     directly to each other.
>
>     This allows for some interesting scalability (we have clusters
>     running in excess of 20K concurrent calls at call rates in excess
>     of 2000 calls/sec)
>
>
>
>     ------------------------------------------------------------------------
>     *From: *Jerry Richards <jerry.richards at teotech.com>
>     *Reply-To: *"freeswitch-dev at lists.freeswitch.org"
>     <freeswitch-dev at lists.freeswitch.org>
>     *Date: *Thu, 27 Aug 2009 08:45:30 -0700
>     *To: *<freeswitch-dev at lists.freeswitch.org>
>     *Subject: *Re: [Freeswitch-dev] Scalabilty of Freeswitch
>
>     Also on a related issue (since I am a novice to Freeswitch),
>     regardless of statistics on number of extensions per system per
>     configuration, I had a more general question:
>
>     That is, does Freeswitch allow for distribution of loading (e.g.
>     supports interface to media servers running on separate machines)?
>      Also, I imagine the SIP signaling part must always be a
>     standalone machine that manages all extensions?
>
>     Best Regards,
>     Jerry
>
>
>
>          
>         ------------------------------------------------------------------------
>         *From:* Mindaugas Kezys  [mailto:mkezys at gmail.com]
>         <mailto:mkezys at gmail.com%5D>
>         *Sent:* Wednesday, August 26, 2009 10:38  PM
>         *To:* freeswitch-dev at lists.freeswitch.org
>         *Subject:* Re:  [Freeswitch-dev] Scalabilty of Freeswitch
>
>          
>          
>          
>
>         Maybe  it would be a good idea to create wiki page just to put
>         such kind of  information in a table:
>
>
>
>         Computer  specs | Other comments | Codecs used | With/Without
>         Media | Max sim. calls  reached | etc
>
>
>
>         That  way interested persons could get a grasp what is really
>         all  about.
>
>
>
>         This  is very common question based on which many people
>         measure switch  capabilities, so in my opinion should be
>         treated with that in mind (as  marketing oportunity)
>
>
>
>         Regards,
>
>         Mindaugas  Kezys
>
>         http://www.kolmisoft.com
>
>         VoIP  Billing and Routing Solutions
>
>
>
>          
>
>         *From:*  freeswitch-dev-bounces at lists.freeswitch.org
>          [mailto:freeswitch-dev-bounces at lists.freeswitch.org]
>         <mailto:freeswitch-dev-bounces at lists.freeswitch.org%5D> *On
>         Behalf Of  *Michael Collins
>         *Sent:* 2009 m. rugpj?čio 26 d.  23:36
>         *To:* freeswitch-dev at lists.freeswitch.org
>         *Subject:* Re:  [Freeswitch-dev] Scalabilty of Freeswitch
>
>
>
>         This question sounds eerily familiar...
>
>          
>
>         On Wed, Aug 26, 2009 at 1:15 PM,  Jerry Richards
>         <jerry.richards at teotech.com>  wrote:
>          
>         Hello All,
>
>         Does anyone  know what the capacity of a stand-alone
>         Freeswitch (assuming  a
>         top-of-the-line server), in terms of how many users?
>          
>          
>
>
>         You can have many hundreds of  users, but there are a lot of
>         factors: network infrastructure, call volume,  etc.
>          
>          
>
>
>
>             Also, when that number is  exceeded, how can Freeswitch
>             server be distributed
>             to accommodate a  larger installation?
>
>
>          
>
>
>         Yes there are strategies. You  definitely want a professional
>         to assist if this is a serious production  environment. There
>         are members of the FS community who do this sort of thing,  or
>         you could email consulting at freeswitch.org to get  assistance
>         from the core FS developers.
>         -MC
>          
>          
>
>         ------------------------------------------------------------------------
>
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