Thats fine for calculating how many users a particular speed network
connection can cope with. 640 concurrent calls on a 100Mbps connection
is doable on a decent machine as long as you are not doing much codec
translation.
Once you get to the point where you start having hundreds of users then
you really need to think about redundancy. OpenSIPS is a good way
forward as it is very light weight and can easily handle tens of
thousands of registered phones. As calls come in then it can forward
them directly or if additional services are required such as possibly
voicemail it can pass them onto one or more asterisk servers in a load
balancing arrangement. Using a couple of database servers replicating to
each other and a virtual IP address (or DNS SRV if the clients properly
support it) will give you redundancy and allow you to add more server to
expand the capacity.
On 19/12/13 05:19, Brian LaVallee wrote:
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.
ยต-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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