[asterisk-users] Problems with the voice quality under load
rwheeler at artifact-software.com
Mon Mar 2 09:56:35 CST 2015
Have you done the math for the network connections? BTF and external
What bit rates for the sound?
How are calls coming in - SIP - analogue
Disks OK(low IO per second)? Caching working OK?
CPU may not be the problem if your CPU utilization is really that low.
On 02/03/2015 10:26 AM, Mordechay Kaganer wrote:
> Hello, all :-)
> We have a cluster of Asterisk (v. 11.9) servers that host IVR
> applications. The servers work behind SIP proxy (kamailio) for load
> All servers are in 2 processor configuration, 8-10 cores per CPU.
> When a particular server gets about 500 concurrent calls, the sound
> quality begins to degrade, the sound plays slowly and with clicks. As
> far as i understand, it's because asterisk is unable to send the voice
> stream in time i.e. the server is overloaded.
> What i don't understand is, at the time that the server appears to be
> overloaded and the audio quality is bad, actual server's load is no
> more than 30-40% (60-70% idle CPU on average). IMHO, this indicates
> that for some reason the server is unable to use it's CPU capacity
> efficiently. May be because of some kind of thread contention inside
> I have read blogs that advice to divide physical server into several
> VMs and they claim that this will improve the total capacity. In my
> own experience, this did not work very well and seems like the
> visualization actually made the quality worse.
> Do you have any advice for me (other than purchasing more servers ;-) ?
> משיח NOW!
> Moshiach is coming very soon, prepare yourself!
> יחי אדוננו מורינו ורבינו מלך המשיח לעולם ועד!
Artifact Software Inc
email: rwheeler at artifact-software.com
phone: 866-970-2435, ext 102
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