[Asterisk-Users] T.38 Faxing -> at astricon ?

[Craig Guy]

The problem as I see it is that if people start expecting it to work then 
rather than being pleasantly surprised when it does, they will be bitterly 
disappointed when it doesn't.  IMHO analog fax over IP is too flaky to 
encourage the general public to utilise, and any suggestion to the contrary 
is misleading.

Having said that, I have an analog fax connected to an ATA that works 100% 
of the time, however I have my ATA and Asterisk on the same ethernet switch. 
I wouldn't expect to have it work reliably over a WAN or other broadband 
internet connection.

Craig

----- Original Message ----- 
From: "Roger Schreiter" <roger at planinternet.de>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users at lists.digium.com>
Sent: Thursday, September 29, 2005 10:31 PM
Subject: Re: [Asterisk-Users] T.38 Faxing -> at astricon ?


> Roy Sigurd Karlsbakk schrieb:
>> ...
>> see http://soft-switch.org/foip.html for a brief explaination of why 
>> this generally doesn't work...
>
>
> Hi,
>
> maybe one should update this link.
>
> I think, you agree, that VoIP is somewhat similar to ISDN, as it
> transports analog audio data in a digitally coded way.
>
> Noone doubts, that ISDN is suitable to transport analog fax.
> Finally the PSTN is 99,9% digital (ISDN/SS7), even if some
> subscriber lines are still analog.
> (Ok, ISDN is a managed network, and thus very high quality.)
>
> Since there are more and more regions in the world, where internet
> connectivity quality approaches to ISDN quality, analog faxing
> over VoIP becomes reliable and hassle free.
>
> You should have 128kbit in both directions, better 256kbit,
> maybe some QoS build in your router (e.g. Linux's iproute2),
> and pingtimes below 20ms to the VoIP-provider (PSTN-gateway).
>
> DSL with fastpath or internet by TV cable does provide this
> standard imho and become more and more available.
>
>
> Thus we shouldn't discourage people generally of faxing, even
> if there are a lot of trouble reports.
>
> Who can count the success stories with (analog) fax over IP,
> which are not posted?
>
> As far as I see, there are more users faxing without observing
> quality differences to ISDN than users with problems with fax
> over VoIP.
>
> This is, what various partners of ours do report after having
> replaced BRI connections by VoIP in some small and middle sized
> companies.
>
>
> Roger.
>
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