[Freeswitch-users] Network Card
krice at freeswitch.org
Thu Aug 14 22:05:53 MSD 2014
1000 CPS the NIC is not the bottle neck this is actually relatively small
amount of TCP/UDP traffic for just the SIP message.
Now the RTP @ 1000 calls on the other hand assuming G711 at 20ms ptime. And
assuming 1 leg calls originating from a dialer would generate 80megabits of
RTP (at the IP layer even more on the wire), and approx 50K PPS. Assuming 2
leg¹d calls bridging media 160megabit and 100K PPS of just RTP...
But then we have to extrapolate peak concurrent from 1000 CPS... Assuming
dialer traffic again, 75% ASR and 20 second ACD, and lets assume the 25% are
just hard failed for the calculation (no early media on these) that gives us
750 new calls/sec and over the course of 20 seconds we accumulate 15,000
So lets take that and extrapolate bandwidth and PPS requirements for single
leg¹d calls of 1.43Gig/sec (on the wire) and 750K PPS so that¹s going to
exceed the bandwidth of a GIG-E connection so you¹d have to break this into
2 RTP endpoints in sofia, and make sure you switches/routers could handle
the PPS loads.
Double that to 2 leg calls and you have 2.86G/sec of RTP (again on the wire
including UDP, IP, ethernet framing over heads) and pushing 1.5million PPS.
Here again this dictates at least 3 gig-e NICs on your FS box. Is this
possible? I¹m sure it is with the right hardware configuration... But lets
step back a minute and really consider what is going on...
You are now putting approx over $2000/hr of traffic on a very expensive box
that can and will at some point fail. Why are you doing such a thing? You¹re
better off limiting rates to sub 1000 CPS, (say 500CPS) deploying 3 boxes to
handle the load in n+1 configuration, and if you lose a box you arent losing
$2000+ in revenue and cranky customers while you repair/replace the now dead
Lets face it, you can purchase a colo a nice machine for say 200 to
300$/month (assuming bandwidth costs are the same as above so that¹s a wash
instead of trying to cram it all on box that ends up costing you 1000/month
by the time you pay for the hardware and colocation expenses for it.
On 8/14/14 11:56 AM, "Russell Treleaven" <rtreleaven at bunnykick.ca> wrote:
> 1000 calls per second... no idea but I really doubt the network interface is
> going to be the bottleneck.
> Not sure why you make a distinction here between sessions and connected.
> To be clear you mean 5000 bridge calls correct?
> Since media is not an issue I think you can just start testing with sipp and
> bwm-ng to see what is what.
> 1000 calls per second is a very big number.
> Let us know how you make out.
> Russell Treleaven
> On Wed, Aug 13, 2014 at 5:40 PM, Andre <andretodd at verizon.net> wrote:
>> 1000 calls per second and 10000 sessions with 4000 connected. What would be
>> From: freeswitch-users-bounces at lists.freeswitch.org
>> [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Russell
>> Sent: Wednesday, August 13, 2014 5:25 PM
>> To: FreeSWITCH Users Help
>> Subject: Re: [Freeswitch-users] Network Card
>> If the media is bypassing you then you only need bandwidth for the
>> Depends primarily on the calls per second.
>> bwm-ng will help you to see whats going on.
>> On Wed, Aug 13, 2014 at 5:20 PM, Andre <andretodd at verizon.net> wrote:
>>>> Hi, is there anything special with the network card to get 10,000 sessions
>>>> in media bypass mode with FreeSwitch? Will a Gig E be enough bandwidth?
>>>> What would it look like if the network card couldn¹t keep up and how can I
>>>> verify the network card is the bottleneck?
>>> Professional FreeSWITCH Consulting Services:
>>> consulting at freeswitch.org
>>> Official FreeSWITCH Sites
>>> FreeSWITCH-users mailing list
>>> FreeSWITCH-users at lists.freeswitch.org
>> Professional FreeSWITCH Consulting Services:
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> Professional FreeSWITCH Consulting Services:
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