[Asterisk-Users] Cisco's description of echo

[Alexander Lopez]

Don't; forget the Milliwatt application in Asterisk
 
 
-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Keith
O'Brien
Sent: Monday, April 25, 2005 4:28 PM
To: lists at masonc.com; Asterisk-Users at lists.digium.com
Subject: RE: [Asterisk-Users] Cisco's description of echo
 
If you are running a Cisco VoIP gateway you can send a 0dBm 1000Khz test
tone into or out of a voice port with:
 
"test voice port <port#> inject-tone network 1000hz"
 
to measure the tone do a:
 
"sh call active voice brief"
 
>>Another common problem that causes echo in networks is not setting
your
>>loss plan correctly.    You need to be sure that you aren't coming in
too
>>hot at any of your analog interfaces.   In general you should see a
signal
>>between -20dbm and -12dbm when someone is talking on the line.   If it
is
>>significantly hotter then you run the chance of having a larger
reflected
>>signal resulting in echo.   I typically try padding down analog levels
by
>>3dB at a time to see if echo is reduced.   
>How do you measure the amplitude of a pstn line? As an audio engineer
in a
>previous life, I would love to be able to send standard level tones
down a
>pstn line and measure the amplitude at my end, then adjust the input
gain
>accurately. Is there a way to do this?
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