Don’t; forget the Milliwatt
application in Asterisk
-----Original Message-----
From:
[EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Keith O'Brien
Sent: Monday, April 25, 2005 4:28
PM
To: [EMAIL PROTECTED];
[email protected]
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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