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Voice Calls are to silent on the PSTN


I´m having a problem with my calls going to the PSTN.

Our curtomers complain that the sound level is very low and they can´t hear us properly.

We are using CM 3.0(11), 3640 with E1 (NM-HDV1E1-30).

The IOS is 12.2.2T ( we also have tested a few other)

voice-port 1/0:15

translate called 1

output attenuation 12

echo-cancel coverage 24

no vad

cptone AT

description Voice E1 Line

The problem could be that the output attenuation 12 doesn´t have any effects - no changes if we change the dB value.

Has someone a solution for that ?




Re: Voice Calls are to silent on the PSTN

Since there has been no response to your post, it appears to be too complex for other forum members to assist you. There are a number of variables in troubleshooting voice quality issues.

You may wish to review these documents:

Should you require further assistance and you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center ( or speak with a TAC engineer. You can open a TAC case online at

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.

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