Re: [hylafax-users] Question about a modem

[Giulio Orsero <giulioo@pobox.com>]

On Wed, 24 Oct 2001 11:01:46 -0400, you wrote:

>> (is there any modem that works with VoIP
>> lines??)
>No.  You need to do special things to fit fax transmissions over VoIP
>networks, because the codecs that are used to compress the voice Will
>Not Work At All with a modem signal.  Except maybe at 300baud.
Then I'm lucky, because my modem does fax at 14400 over VoIP :-)
A cheap rockwell class1. Our VoIP stuff explicitly support FAX connection (but
no data connection, no ppp), I think you tell it "this port will have a fax" or
similar.

However, I've another modem that does not work because it wants only 2 wires
phone cables, while the VoIP cable is 4 wires; this modem always "hears" RINGs
on the line while there's none.

BTW the VoIP we use is a MultiTech, so they have experience in fax-modems.

-- 
giulioo@pobox.com


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