asterisk users - Dec 2013 - Maximum number of users

Hello;

Can someone advise me what is the maximum number of users (IP Phones) that can
be supported by asterisk 1.8 or later?

Regards
Bilal
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You can have tens of thousands of phones as long as no one makes or receives
any calls J. The better question to ask is how many concurrent calls have
people been able to make. The quick answer is it depends on many things. 

John 

 

From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of bilal ghayyad
Sent: Wednesday, December 18, 2013 9:46 AM
To: Asterisk Users Mailing List - Non- Commercial Discussion
Subject: [asterisk-users] Maximum number of users

 

Hello;

 

Can someone advise me what is the maximum number of users (IP Phones) that
can be supported by asterisk 1.8 or later?

 

Regards

Bilal

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The better question is,  maximum number of users (IP Phones) can your
hardware support. I have * deployments with 300-600 phones. - works fine.
though concurrent calls has never seen more then 244. Also at this point I
have to ask, for this to be any concern to you, you must either A, Make
tons of internal calls. OR B have multiple T1's/lots of sip channels?

Regards,

Keith Sloan
Voice Operations Center
Vianet
705-222-9996 X7203
1-800-788-0363 X7203
keiths at vianet.ca


On Wed, Dec 18, 2013 at 9:45 AM, bilal ghayyad <bilmar_gh at yahoo.com>
wrote:
> Hello;
>
> Can someone advise me what is the maximum number of users (IP Phones) that
> can be supported by asterisk 1.8 or later?
>
> Regards
> Bilal
>
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Hi Bilal,

Assuming you have the latest hardware, sufficient memory, cpu, etc...
The key to determine the maximum number of users comes down to the 
office type, RTP path, network interface, and primary codec used.

First we need to determine the over-subscription rate, how many people 
will be using the phones at any given time.

For a call center, the ratio is 1:1.
For a normal office, the industry standard is 4:1.
{This ratio is also used to determine the number of PSTN channels you 
will need too}

Will the PSTN connections be Digium card(s) in your server or external 
gateway(s)?
Assuming Diguim card(s), the RTP will be going through your server.

Determine the network interface.  10/100/1000baseT
Then we need to consider the largest codec used, and divide the 
available bandwidth by the typical packet size.

?-law/A-law is roughly 80 kbps, so we can support 128/1280/13107 audio 
streams.
Divide that by 2 (just to be safe) and allow RTP in both directions. 
64/640/6553

Now multiple the result by the over-subscription ratio.  4:1 = 
256/2560/26212

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.
You would also need to have 640 channels (28 T1 PRI's) connecting to the 
PSTN.
/Using SIP trunks to connect to the PSTN through the same 100baseT NIC 
will reduce the maximum number of users you can support./

The real challenge is not supporting thousands of users (IP Phones), 
it's connecting a sufficient number of PSTN connections to support those 
users.


Sincerely,
Brian LaVallee




On 12/18/13, 11:45 PM, bilal ghayyad wrote:
> Hello;
>
> Can someone advise me what is the maximum number of users (IP Phones) 
> that can be supported by asterisk 1.8 or later?
>
> Regards
> Bilal
>
>
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On Wed, Dec 18, 2013 at 9:45 AM, bilal ghayyad <bilmar_gh at yahoo.com>
wrote:
> Hello;
>
> Can someone advise me what is the maximum number of users (IP Phones) that
> can be supported by asterisk 1.8 or later?
>
> Regards
> Bilal
>
>
The number of devices and concurrent calls is dependent on many factors.
Dialplan complexity, new call rate, features enabled, and transcoding all
play a factor in these numbers.

To give you an example I have a Dell R710 with two quad core E5520
processors running Asterisk 1.8 and FreePBX 2.11. I have around 1,000 SIP
device registrations, 50-80 concurrent calls for the majority of the day,
and a total of 8-10k calls processed per day. A few times a week I will see
the last minute load at 20 and the 5 min load at 7. This seem to happen
when there are a high volume of new calls as the FreePBX dialplan is
complex.

Ryan
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