Re: V17 vs V34, MSANs and faxanswer

On 06/06/2018 03:30 AM, Christo Labuschagne wrote:
>
> We have a problem on a line (that is very far away and not manned by a=20
> specialist) where sending a fax works fine but we cannot receive a=20
> fax.=C2=A0 It answers but does not want to train or trains at 2400 and =
then=20
> no data gets through.=C2=A0 A V17 fax machine works fine though.

Showing us a session log would be helpful.

> After a lot of studying of how network infrastructure works, we have=20
> learned that networks use CED or /ANSam to open up the channel with=20
> either T.38/G711 for CED or G711 for /ANSam.
> Do you guys have any idea if this is correct?

If you must use VoIP for a fax line then you must make sure that the=20
line is always G.711 or that it switches to T.38 properly.=C2=A0 Still, i=
t's=20
not going to be as good as a PSTN line.

> If it is correct, have you ever had lines that does not support /ANSam?

Without a huge amount of luck you won't be able to do V.34 on a VoIP=20
line reliably.

> The same modem can be connected to various interfaces, so in some=20
> cases we would like to answer with V17 (PSTN) and in other cases V34=20
> (PABX).=C2=A0 faxanswer does not have an option to specify a speed limi=
t=20
> like sendfax has with -B.=C2=A0 The only way I could limit the answerin=
g=20
> fax modem to answer with CED is to remove the=C2=A0Class1EnableV34Cmd f=
rom=20
> the config.
> Is there a way to configure the answering mode (CED or ANSam) on the fl=
y?

Yes, using DynamicConfig.=C2=A0 See 'man hylafax-config'.

http://hylafax.sourceforge.net/man/hylafax-config.php

Thanks,

Lee.


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