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× Questions about A400/800/1200 Analog Interface Card

Annoying beep with A400P on PSTN

11 years 5 months ago #7441 by zanca
Hi, i have a problem with the A400P card. During conversation through the pstn line i hear a random (and annoying) beep. The person on the other side don't hear it. I've read some posts about the same problem, but the answer didn't help. I have no shared irqs as shown by cat /proc/interrupts:
CPU0       CPU1
  0:    2060576          0    IO-APIC-edge  timer
  1:          9          0    IO-APIC-edge  i8042
  8:          1          0    IO-APIC-edge  rtc
  9:          0          0   IO-APIC-level  acpi
 12:          4          0    IO-APIC-edge  i8042
 14:       6256      13538    IO-APIC-edge  ide0
 15:      17980          0    IO-APIC-edge  ide1
185:       1156     142853   IO-APIC-level  ehci_hcd:usb1, uhci_hcd:usb4, sata_via
193:          0          0   IO-APIC-level  uhci_hcd:usb2
201:          0          0   IO-APIC-level  uhci_hcd:usb3
209:         35      79036   IO-APIC-level  uhci_hcd:usb5, eth0
217:    2017730          0   IO-APIC-level  wctdm
225:    2005040          0   IO-APIC-level  b4xxp
NMI:          0          0
LOC:    1994893    1994900
ERR:          0
MIS:          0
I've tried everything, but i can't get rid of this beep. Also the sound quality isn't really good, i hear a constant noise in background. Sometimes i hear a "broken" voice, and some words went missing.This is my configuration, by now i only use the A400P and not he B400P.
$dmesg | grep dadhi
dahdi: Telephony Interface Registered on major 196dahdi: Version:
dahdi_transcode: Loaded.
dahdi_echocan_mg2: Registered echo canceler 'MG2'
$cat /etc/asterisk/chan_dahdi.conf
; DAHDI telephony
; Configuration file



rxwink=300              ; Atlas seems to use long (250ms) winks
; Whether or not to do distinctive ring detection on FXO lines

; Some DAHDI echo cancellers (software and hardware) support adjustable
; parameters; these parameters can be supplied as additional options to
; the 'echocancel' setting. Note that Asterisk does not attempt to
; validate the parameters or their values, so if you supply an invalid
; parameter you will not know the specific reason it failed without
; checking the kernel message log for the error(s) put there by DAHDI.
; In some cases, the echo canceller doesn't train quickly enough and there
; is echo at the beginning of the call.  Enabling echo training will cause
; DAHDI to briefly mute the channel, send an impulse, and use the impulse
; response to pre-train the echo canceller so it can start out with a much
; closer idea of the actual echo.  Value may be "yes", "no", or a number of
; milliseconds to delay before training (default = 400)
; WARNING:  In some cases this option can make echo worse!  If you are
; trying to debug an echo problem, it is worth checking to see if your echo
; is better with the option set to yes or no.  Use whatever setting gives
; the best results.
; Note that these parameters do not apply to hardware echo cancellers.
; If you are having trouble with DTMF detection, you can relax the DTMF
; detection parameters.  Relaxing them may make the DTMF detector more likely
; to have "talkoff" where DTMF is detected when it shouldn't be.


;Include setup-pstn configs
#include dahdi-channels.conf


;Include PBXconfig configs
#include chan_dahdi_additional.conf
Thanks, Zanca

i] Last edited by zanca at 2011-10-21 00:20 [/i
11 years 5 months ago #7442 by chunlei.yi
please supply ssh to me, I will help you to check it
my email : This email address is being protected from spambots. You need JavaScript enabled to view it.
11 years 5 months ago #7446 by zanca
[font=arial, sans-serif]Hi, i'm sorry, but i can't give you access via ssh because my company does not allow it. Other suggestions? [/font]
11 years 5 months ago #7451 by chunlei.yi
you will confirm the pstn line doesn't have problem. please disable echotraining=400 and open echocancel=yes to try in chan_dahdi.conf
7 years 10 months ago #10357 by stefino82
hello I have the same problem I do not know how to solve
You have solved ?
7 years 10 months ago #10358 by crystal.han
pls contact me on skype,i will help you to check it.
Skype :crystalhan6
The following user(s) said Thank You: stefino82
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