Re: [hylafax-users] Hylafax&ISDN and UseISDNFaxService

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

On 2004.06.28 05:37 Vladimír Bobek wrote:
> Hi
> I am using Hylafax in conjunction with capi4hylafax and AVM Fritz ISDN
> card.
> Now I explore the config files and I wonder, what is the exact meaning
> of
> UseISDNFaxService option in config.faxCAPI file?
>
> In the file there is the following comment:
> #When in "UseISDNFaxService" the value is = 1, an outoing call will be
> # established using the ISDN-FAX-G3 service indicator. For 0, a 3.1kHz
> # audio connection is established.
>
> Does anyone know what is meant by the ISDN-FAX-G3 service and in which
>
> conditions it is possible/suitable to use it?

Digital faxing is only possible between two digitally connected fax 
devices (i.e., ISDN-to-ISDN).

Due to communication medium differences, there are some capabilities 
that are made available to a digital device that are not available to 
analog devices.  Specifically, I'm talking about T.30 Annex C, or "full 
duplex error correction mode".

> Is there any difference between g3 service on analog modems (which is
> standard
> for years I think) and g3 service on ISDN?

It seems, however, that if you enable that feature that it will disrupt 
your connectivity with analog devices:

http://www.hylafax.org/archive/2003-07/msg00312.php

Apparently AVM hasn't made it automatically switchable.

Lee.

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