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<font size="-1">Hi Bilal,<br>
<br>
Assuming you have the latest hardware, sufficient memory, cpu,
etc... <br>
The key to determine the maximum number of users comes down to the
office type, RTP path, network interface, and primary codec used.<br>
<br>
First we need to determine the over-subscription rate, how many
people will be using the phones at any given time. <br>
<br>
For a call center, the ratio is 1:1. <br>
For a normal office, the industry standard is 4:1. <br>
{This ratio is also used to determine the number of PSTN channels
you will need too}<br>
<br>
Will the PSTN connections be Digium card(s) in your server or
external gateway(s)?<br>
Assuming Diguim card(s), the RTP will be going through your
server.<br>
<br>
Determine the network interface. 10/100/1000baseT<br>
Then we need to consider the largest codec used, and divide the
available bandwidth by the typical packet size.<br>
<br>
µ-law/A-law is roughly 80 kbps, so we can support 128/1280/13107
audio streams.<br>
Divide that by 2 (just to be safe) and allow RTP in both
directions. </font><font size="-1"><font size="-1">64/640/<span
class="cwcot" id="cwos">6553</span></font><br>
<br>
Now multiple the result by the </font><font size="-1"><font
size="-1">over-subscription</font> ratio. 4:1 = 256/2560/26212<br>
<br>
So we see that the maximum number of users is 2560 for a normal
office when there is a 100baseT NIC in your Asterisk server.<br>
You would also need to have 640 channels (28 T1 PRI's) connecting
to the PSTN.<br>
<small><i>Using SIP trunks to connect to the PSTN through the same
100baseT NIC will reduce the maximum number of users you can
support.</i></small><br>
<br>
The real challenge is not supporting thousands of users (IP
Phones), it's connecting a sufficient number of PSTN connections
to support those users.<br>
<br>
<br>
Sincerely,<br>
Brian LaVallee</font><br>
<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 12/18/13, 11:45 PM, bilal ghayyad
wrote:<br>
</div>
<blockquote
cite="mid:1387377943.35389.YahooMailNeo@web160803.mail.bf1.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff;
font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial,
Lucida Grande, sans-serif;font-size:12pt">
<div>Hello;</div>
<div><br>
</div>
<div style="color: rgb(0, 0, 0); font-size: 16px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;">Can someone advise me what is the maximum
number of users (IP Phones) that can be supported by asterisk
1.8 or later?</div>
<div style="color: rgb(0, 0, 0); font-size: 16px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;"><br>
</div>
<div style="color: rgb(0, 0, 0); font-size: 16px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;">Regards</div>
<div style="color: rgb(0, 0, 0); font-size: 16px; font-family:
HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida
Grande', sans-serif; background-color: transparent;
font-style: normal;">Bilal</div>
</div>
<br>
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