Although the nature of this problem seems to vary, the customer reports that the crackling usually starts when an external call is received at which time the crackling overwhelms all voice channels and everyone has to hang up and re-establish the calls (after which everything works fine again).
Could it be possible that a problem with the TDM400P could affect SIP calls on Asterisk as well?
I don't think I have an interrupt problem (see interrupt table pasted below) and the output of zttest appears to be ok (at least as good as 99.96% accuracy), so we are stumped. Linux, Asterisk and ISDN driver versions as follows. Appreciate any help you can offer.
Cheers, Damian.
1) Linux localhost.localdomain 2.4.21-4.ELsmp #1 SMP Fri Oct 3 17:52:56 EDT 2003 i686 i686 i386 GNU/Linux
2) Asterisk 1.0.6 built by [EMAIL PROTECTED] on a i686 running Linux
3) divas4linux_2_4_21_4_RHEL3_i686_SMP-104.345-1
*** zttest output *** --- Results after 43 passes --- Best: 99.975586 -- Worst: 99.963379
*** End zttest output ***
*** Interrupt Table ***
[EMAIL PROTECTED] root]# cat /proc/interrupts
CPU0 CPU1
0: 40674647 0 IO-APIC-edge timer
1: 969 0 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
6: 282 0 IO-APIC-edge floppy
8: 1 0 IO-APIC-edge rtc
12: 7132 0 IO-APIC-edge PS/2 Mouse
14: 6650 1 IO-APIC-edge ide0
16: 0 0 IO-APIC-level usb-uhci
17: 406583244 0 IO-APIC-level wctdm
18: 5450488 0 IO-APIC-level eth0
19: 0 0 IO-APIC-level usb-uhci
21: 11834725 0 IO-APIC-level DIVA 4BRI 15587
23: 0 0 IO-APIC-level ehci-hcd
27: 339738 0 IO-APIC-level a320raid
NMI: 0 0
LOC: 40673196 40672862
ERR: 0
MIS: 0*** End interrupt table ***
FFF Managed Technology Ltd 60 Cook St P.O. 6368 Wellesley St Auckland t +64 9 356 2911 f +64 9 358 9070 m +64 21 415 297 w www.fff.co.nz
Rich Adamson wrote:
I'm experiencing terrible trouble with crackling and noise on an analogue line connected to an X100P (compatible) card. I've checked the line with a normal analogue phone and it works fine, clear as a bell, but any outgoing or incoming calls to Asterisk are almost completely drowned out by loud crackling.
I've attempted to adjust the RX and TX gains, but to no avail. There's also an echo, but only one way. I'm assuming this is a separate issue so I've not done much to investigate that, but I may be wrong so if it is related does anyone have any suggestions?
I never had this trouble with ISDN, but then I wouldn't would I? :)
If anyone can wave a magic wand, or at the very least point me to a
website where I can get my own magic wand, please let me know.
What country are you in, and does the chipset on the compat card support the telco standards in your country?
If the chipset doesn't match your telco standards, there is a high probability you won't get rid of the echo. If it does match, then try echotraining=800 echocancel=yes
Regarding the crackling noise, have you checked for shared interrupts (cat /proc/interrupts)?
If you run "cat /proc/interrupts" every ten seconds, do you see calculated interrupt values of about 1,000?
Go to /usr/src/zaptel directory and run ./zttest Do you get something close to 100% over some period of time?
What version of asterisk are you running?
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