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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The question is somewhat ludicrous, and I’m
slightly surprised that no-one has sat down and done the maths about bandwidth utilization.
So I did.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>To handle 5000 calls coming in over a PRI,
you’d need 210 or so T1s or 170 E1’s.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>All of those would generate 320Mega BYTES of
data per second (eg, 32Gigabit/sec)</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>There is no way possible that you’re
going to pump that amount of data through a PC. Don’t care about codecs
and dialplans, PC’s just don’t have that sort of internal bandwidth
from peripherals.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>If you do, honestly, need to handle 5k
calls, you’d probably have to have a bank of Cisco 5850s doing the
termination – With a max of 5 DS3 (1 DS3 = 28 T1’s) into each one,
you’ll need 8, or probably 9 as you’d want to have one as a hot
spare. Each of those DS3’s would go into some beefy switching fabric
(note, that each one is producting 225mbit) and you’d have some sort of asterisk
box with huge internal bandwidth handling each one. Cross connect all 9
asterisk boxes via 10Gbit networks (note, you’ll need PCI-16x 10g cards)
and have a pair of voicemail servers. I’d suggest a pair of big Sun
boxes.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Then, of course, you have the issue of
getting the calls _<i><span style='font-style:italic'>out</span></i>_ of the
asterisk machines. You’ve just doubled your bandwidth requirements, so
you’ll need to double up on the asterisk machines, and split the network
up further.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I’d take a guess that you could do
it under USD$1million (just for hardware) but I wouldn’t be surprised if it
was USD$10million.</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I’m happy to sell you any of this 8-)</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>--Rob</span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
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<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Vic<br>
<b><span style='font-weight:bold'>Sent:</span></b> Sunday, 29 January 2006 1:16
PM<br>
<b><span style='font-weight:bold'>To:</span></b> asterisk-users@lists.digium.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Asterisk-Users]
5,000 concurrent calls system rollout question</span></font></p>
<p class=MsoNormal><font size=3 face="MS PGothic"><span style='font-size:12.0pt'> </span></font></p>
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<p><font size=3 face="MS PGothic"><span style='font-size:12.0pt'>Hi, Zoa, </span></font></p>
<p><font size=3 face="MS PGothic"><span style='font-size:12.0pt'>yes, these
calls are from SIP to SIP. We will have more than 3000 (more like
5000)concurrent calls come into system and we will need to handle them. </span></font></p>
<p><font size=3 face="MS PGothic"><span style='font-size:12.0pt'>We will also
need an IVR function as well. </span></font></p>
<p><font size=3 face="MS PGothic"><span style='font-size:12.0pt'>I am not up
to speed on Asterisk yet, so, I am a little bit confused by all the different
ways of doing it. Someone is talking about IAX:</span></font><font
face="Times New Roman"><span style='font-family:"Times New Roman"'> </span></font>
I think it can only be used between Asterisk servers, right? </p>
<p><font size=3 face="MS PGothic"><span style='font-size:12.0pt'>In this
particula rscenario we are getting calls as SIP directly from carrier, so we
will not need to do any conversion (I think). We just route the calls to the
destination, that's it. </span></font></p>
<p><font size=3 face="MS PGothic"><span style='font-size:12.0pt'>Any
suggestions on how to proceed? Can Asterisk do it? </span></font></p>
<p><font size=3 face="MS PGothic"><span style='font-size:12.0pt'>I read
somewhere that it takes about 30 MHz per one voice channel, so if we want to
have 5,000 calls, we will need 150,000 MHz? Thats like 50 3 GHz machines...
Not going to fly with our people.</span></font><font face="Times New Roman"><span
style='font-family:"Times New Roman"'> </span></font> </p>
<p><font size=3 face="MS PGothic"><span style='font-size:12.0pt'>Or do 30 MHz
are only necessary for transcoding? In other words, if it comes in as SIP and
we keep it that way, can</span></font><font face="Times New Roman"><span
style='font-family:"Times New Roman"'> </span></font>we make it<font
face="Times New Roman"><span style='font-family:"Times New Roman"'> </span></font>a
bt more feasible number?<font face="Times New Roman"><span style='font-family:
"Times New Roman"'> </span></font> </p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt;
font-family:"Times New Roman"'> </span></font> </p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt;
font-family:"Times New Roman"'> </span></font><b><i><span
style='font-weight:bold;font-style:italic'>Zoa <zoachien@securax.org></span></i></b>
wrote: </p>
<blockquote style='border:none;border-left:solid #1010FF 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt'>
<p class=MsoNormal><font size=3 face="MS PGothic"><span style='font-size:
12.0pt'><br>
It can be done, are those 3000 calls sip to sip ? If so it could easily<br>
be done, if they are not sip to sip you will need a bunch of servers.<br>
<br>
Zoa.<br>
<br>
Vic wrote:<br>
<br>
> Hi,<br>
><br>
> we are currently considering different options for rolling out a large<br>
> scale IP PBX to handle around 3,000 + concurrent calls.<br>
><br>
> Can this be done with Asterisk? Has it been done before?<br>
><br>
> I really would like an input on this.<br>
><br>
> Thanks!<br>
><br>
>------------------------------------------------------------------------<br>
><br>
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