[asterisk-users] IAX2 trunking scalability

[zoachien]

Jean-Michel Hiver wrote:
>> So you are using an asterisk box as an E1 gateway. You want to know if
>> switching from not using IAX trunking to using IAX trunking will have
>> any effect? Yes.... it will lower your bandwidth usage a little. It
>> will not increase the CPU load. If your system can support x calls it
>> will be able to support the same amount of calls.
>>     
>
> On about 1/2 E1, it shows that bandwith usage has been about halved - i.e.  
> without trunking each G.729 call takes 50 kbps (inbound + oubound) and  
> with IAX2 trunking it takes about half of that (using trunkfreq=40). Which  
> is good!
>
> I'm wondering wether anybody already had a IAX2 trunking ON and managed to  
> push 3 E1s worth of traffic without issues.
>
>
>   
I used to do it, but its a while ago. (Before iax2 got some more fixes)
The trick was to keep the trunks small (like 40 per trunk, just make 
multiple), this should no longer be needed.
Cpu utilisation with trunking should be lower than without trunking.

zoa
>> The best thing you can do for your system is add a TC400B card. It
>> will also legally support G723 codec which I think sounds just fine,
>> but will save you a bit more bandwidth. Using the hardware transcoder
>> will greatly increase the number of calls your system would be able to
>> handle.
>>     
>
> I'm already receiving the calls as g.729, so there is little gain  
> (slightly less bandwith usage, slighly worse sound) in doing g.729 ->  
> g.723 transcoding - while doing IAX2 trunking vs NOT doing it seems to  
> half the bandwith requirement.
>
> Cheers,
> Jean-Michel.
>
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