VoIP Mailing List Archives

[matt at xenotran.com]

I recently moved an installed and working Asterisk system from one PC to
another. I moved two Digium TDMXX cards and the OS as well (a live
distro). I tuned the hardware on the new PC, but for some reason analog
calls periodically have some electronic noise. It's like beeps, but more
musical. I do not recall noticing this on the old PC, but immediately
noticed it on the new system. Since the hardware and the OS are the same,
I'm not sure what could be causing this issue, or how to remedy it. Any
ideas?

Thanks,
Matthew Yingling

[stotaro at totarotechn...]

On Jan 31, 2008 12:28 PM, Matthew Yingling <matt at xenotran.com> wrote:

[tnelson at rockbochs.com]

I second that. IRQ issues are more than likely causing the problem. Check your interrupts and see if your TDM cards are sharing IRQs with any other devices. From past experience, I know we would get the same behavior when an analog card was sharing an IRQ with a storage controller. Any amount of disk activity would cause little blips and beeps in the audio stream. Make sure you have all extraneous unneeded devices turned off in the BIOS.

Tim Nelson
Systems/Network Support
Rockbochs Inc.
(218)727-4332

----- Original Message -----
From: "Steve Totaro" <stotaro at totarotechnologies.com>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" <asterisk-users at lists.digium.com>
Sent: Thursday, January 31, 2008 11:34:18 AM (GMT-0600) America/Chicago
Subject: Re: [asterisk-users] Digium TDMXXB and Electronic Noises

On Jan 31, 2008 12:28 PM, Matthew Yingling <matt at xenotran.com> wrote:

[matt at xenotran.com]

You are probably both correct. I noticed that both of our TDM cards, and
the Ethernet card are all sharing the same IRQ. Since we do VOIP
internally and analog externally, that IRQ is getting hit twice for any
outbound or inbound calls. The system is new, and the OS supports ACPI, so
I'm not yet sure what's going on.