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Obsolete Releases => SME VoIP (Asterisk, SAIL etc) => Topic started by: ntblade on August 26, 2009, 06:16:55 PM

Title: Echo apparent in echo test
Post by: ntblade on August 26, 2009, 06:16:55 PM

Hi all,
Can anyone point me in the right direction to minimise the echo in my system?  When running an ech test using *52* the echo is really quite apparent.  Any codec or other settings to try?

Thanks,

Norrie

Title: Re: Echo apparent in echo test
Post by: SARK devs on August 26, 2009, 09:58:13 PM

Hi Norrie,


Despite its name, *52* isn't really a test for echo; it's a latency test.  Asterisk is just bouncing your packets back to you as fast as ever it can. In practice, you'll get a much more accurate result by looking on extensions main panel or by doing sip show peers at the asterisk console.   Even on locally attached phones you will often see latencies above 100ms.  Your ear will hear anything above about 70ms so you will hear the delay using *52*. However, latency alone doesn't start to matter until it hits around 200ms or more in a real phonecall because each party can only hear one side of the call.

You can only test for "true" echo by calling someone up. If you get echo doing that then you may have a problem.  If not, and there is no appreciable lag on the circuit, then you are good to go.

Best

S