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Running a modem over a VOIP line

DeicistDeicist Registered User regular
edited November 2010 in Moe's Stupid Technology Tavern
Hi all, I've done some googling for this but am unable to find a definitive answer:

Is it possible to run a 9.6Kb modem over a VOIP line?

We have some building management equipment that requires a modem connection and, at present, this is costing us a fortune in landline charges. If we could move this onto a VOIP service, we'd save a packet (ha, network pun). I understand there's issues with routing and so on with faster (56K) modems since they 'tune' to an assumed stable connection, and there's also issues with VOIP lines cutting out the frequencies that modems operate at.... however, I can't find a straight up yes or no answer for my scenario.

So, anyone have any experience with this?

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Tall-Paul MIPsDroid
Deicist on

Posts

  • TofystedethTofystedeth Registered User regular
    edited October 2010
    I'm of the opinion it's not feasible, but damn if I wouldn't like to see someone try.

    Tofystedeth on
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  • ThomamelasThomamelas Only one man can kill this many Russians. Bring his guitar to me! Registered User regular
    edited October 2010
    It is possible depending on how the VOIP system is set up. If your provider has support for V 150.1, then you can run slower modems over it. You are going to need to set up QoS to give priority to the modem, any kind of packet loss is going to kill the connection.

    Thomamelas on
  • UnknownUnknown
    edited October 2010
    This content has been removed.

  • UnknownUnknown
    edited October 2010
    This content has been removed.

  • ThomamelasThomamelas Only one man can kill this many Russians. Bring his guitar to me! Registered User regular
    edited October 2010
    mcdermott wrote: »
    Hey, sorry to dig this back up, but I was just thinking...

    I've been sending faxes over my VOIP line (we get it through Comcast), and they seem to work just fine. Doesn't this imply that at least low-bitrate (9600 or so) modem connections should work as well? Aren't the standards pretty similar?

    Though I've never sent more than a page or two, so no idea how stable the connection is for long-term transmission.

    You're only ever going to get slower modem speeds to work. Faster modem speeds won't sync quite right. And the slower modem speeds are very much dependent on how low latency the connection is and what compression methods are used. Modems used some tones that humans don't make very often, and some of the compression methods will cut those sound ranges off.

    Thomamelas on
  • UnknownUnknown
    edited October 2010
    This content has been removed.

  • AridholAridhol Daddliest Catch Registered User regular
    edited November 2010
    relatively slow connections work just fine. 56k sometimes can be a pain.

    Aridhol on
  • UnknownUnknown
    edited November 2010
    This content has been removed.

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