TELECOM Digest OnLine - Sorted: Re: FAX vs VOIP

Re: FAX vs VOIP

I am a Sock Puppet (strap@hanh-ct.org)
Mon, 08 Aug 2005 16:25:42 -0400

John McHarry wrote:

> This is really a reply to a question posted on a discussion of Lingo,
> but the subject is really quite different from that of the original
> thread.

> I believe the issue with FAX over VOIP is that VOIP uses lossy
> compression that does not treat FAX modulation gently.

Depends the VOIP. But (when set to "high quality mode) use g7.11 for
the codec. This is the same that most digital lines (ie: isdn, t1) use
- so in most cases lossy compression is NOT an issue.

What IS often an issue is latency in the IP connection -- this
translates into audio latency. For instance, a 250ms delay on the IP
end means that there is a 1/4 second delay in the audio -- the
recieving end hears the audio 1/4 second after it is sent.

That sort of thing can play havoc with modems and faxes.

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