[Asterisk-Users] Re: [Asterisk-biz] Problem with sending fax froma SIP extension

[Tom Hayden]

Well, I think what he means is that it's not VoIP, because you are
using TDM on both ends. It looks like this:
fax machine -> TDM -> * -> TDM -> PSTN

If you had a SIP ATA attached to a fax machine, you would be using
VoIP. That would look like this:
fax machine -> SIP/VoIP -> * -> TDM -> PSTN

I have found using faxes over any VoIP to be *extremely* unreliable. 
SpanDSP works pretty good, but you won't have much luck using a fax
SIP extension.

Cheers,

--
Tom

On 9/29/05, Jonathan k. Creasy <jonathan at bluegrass.net> wrote:
> Why is what he is doing different than having the fax machine on a
> Sipura ATA?
>
> Just because both those ports are on the pci card that doesn't make them
> not Voice in between....if I'm wrong....eh...oh well....
>
> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com
> [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of C F
> Sent: Wednesday, September 28, 2005 9:45 PM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [Asterisk-Users] Re: [Asterisk-biz] Problem with sending
> fax froma SIP extension
>
> Before responding please read my message again, in my message I worte:
> 'faxing over VoIP' what you are doing is NOT over VoIP.
>
> On 9/28/05, u <calanet at gmail.com> wrote:
> > On 9/27/05, C F <shmaltz at gmail.com> wrote:
> > > 1. Search the archives
> > > 2. Search again
> > > 3. Now search the internet
> > > 4. The fact is that faxing over VoIP without T.38 doesnt really
> work.
> > > Because it works 60% of the time it doesn't mean that it works,
> until
> > > it works 99% of the time.
> > > Since Asterisk does NOT support T.38 it doens't support faxing over
> > > VoIP other solutions are available, search the wiki.
> > >
> > >
> > > On 9/26/05, Mark Armstrong <marmstrong at accaustralia.com.au> wrote:
> > > > I am having exactly the same problem.  Any information would be
> appreciated.
> > > > Faxing is a commercial proposition that my team is working on, any
> > > > limitations of Asterisk or E1 cards needs to be highlighted.
> > > >
> > > >
> > > > Regards
> > > >
> > > > Mark
> > > >
> >
> >
> > > >
> > > > -----Original Message-----
> > > > From: asterisk-biz-bounces at lists.digium.com
> > > > [mailto:asterisk-biz-bounces at lists.digium.com] On Behalf Of C F
> > > > Sent: Tuesday, 27 September 2005 9:42 AM
> > > > To: andy at akuo.ca; Commercial and Business-Oriented Asterisk
> Discussion
> > > > Subject: Re: [Asterisk-biz] Problem with sending fax from a SIP
> extension
> > > >
> > > > why don't you post this to asterisk-users?
> > > >
> > > > On 9/22/05, Andy Kuo <akuoca at gmail.com> wrote:
> > > > > Hi All,
> > > > >
> > > > > I'm having problem sending fax from SIP extensions (Linksys
> PAP2)
> > > > > through Asterisk Zap channels (ISDN PRI).
> > > > > The SIP extensions can receive fax without problems, but sending
> fax
> > > > > fails most of the time.
> > > > >
> > > > > Does anyone have this problem?
> > > > >
> > > > > Please advice.
> > > > > Thank you.
> > > > > AK
> > I have a fax connected to a zaptel pci card (FXS).  Fax are sent right
> > into an FXO card connected to my PSTN.   I don't experience problems
> > but then again I am a light user.
> > Just out of curiosity, is the problem related to sending FAX via IAX
> > or SIP to another asterisk server?
> > if asterisk will support T.38 passthru to say Hylax Fax, does that
> > mean I need a Hylax fax daemon in every asterisk server?
> >
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--
Tom