[cisco-voip] Fwd: Cisco ATA Fax Confusion

[Rhodium]

Can't find anything about that particular fax oIP method from googling or on CCO??

All I can find are the relay types, and the pass-through/passthrough types.

Regards,

Jason

--- On Fri, 1/22/10, Ryan Ratliff <rratliff at cisco.com> wrote:

> From: Ryan Ratliff <rratliff at cisco.com>
> Subject: Re: [cisco-voip] Fwd:  Cisco ATA Fax Confusion
> To: "Rhodium" <rhodium_uk at yahoo.co.uk>
> Cc: "cisco-voip at puck.nether.net Group" <cisco-voip at puck.nether.net>
> Date: Friday, January 22, 2010, 9:40 PM
> It's basically the same as the
> straight g.711 fax pass-through.  I think the only
> difference with this and modem passthrough is that when we
> detect the fax tones we'll turn off some of the DSP features
> (ecan, etc) that are useful for voice but not for fax.
> 
> -Ryan
> 
> On Jan 22, 2010, at 4:34 PM, Rhodium wrote:
> 
> Thanks for following it up internally. :)
> 
> What is this by the way in terms of fax protocols:
> 
> > The other option is that it has fallen back to g.711
> low
> > speed fax and you are getting lucky. 
> 
> 
> --- On Fri, 1/22/10, Ryan Ratliff <rratliff at cisco.com>
> wrote:
> 
> > From: Ryan Ratliff <rratliff at cisco.com>
> > Subject: Re: [cisco-voip] Fwd:  Cisco ATA Fax
> Confusion
> > To: "Rhodium" <rhodium_uk at yahoo.co.uk>
> > Cc: "cisco-voip at puck.nether.net
> Group" <cisco-voip at puck.nether.net>
> > Date: Friday, January 22, 2010, 9:26 PM
> > I ran this by somebody that actually
> > works fax issues every day and there are two ways your
> call
> > can be working.
> > 
> > The first is that modem passthrough is actually being
> > used.  This can be confirmed by waiting 10
> seconds
> > after the call is answered and looking at the output
> of
> > 'show call active voice brief'.  If you see
> modem-pass
> > here then it's switched to modem passthrough.
> > 
> > The other option is that it has fallen back to g.711
> low
> > speed fax and you are getting lucky. 
> > 
> > -Ryan
> > 
> > On Jan 22, 2010, at 4:15 PM, Ryan Ratliff wrote:
> > 
> > Are your calls working in one direction only or both
> > ways?  We are all in agreement that the ATA only
> > supports NSE based passthrough and I do know that the
> > default fax protocol on cisco routers is modem
> passthrough
> > so maybe there's another bit of your config that's
> allowing
> > the call to proceed.
> > 
> > In the doc you referenced it mentions that no
> fall-back
> > will still allow for the fax to proceed if modem
> passthrough
> > is configured..  Maybe this also applies if fax
> > pass-through fallback isn't successful. 
> > 
> > -Ryan
> > 
> > On Jan 22, 2010, at 3:50 PM, Rhodium wrote:
> > 
> > Yep, I am aware of the hyphenations. Been trying to
> use
> > them in the right context if you look at my emails.
> ;o)
> > 
> > I don't think the fall back command applies to NSE
> > passthrough but protocol based pass-through:
> > 
> > http://www.cisco..biz/en/US/docs/ios/12_3/vvf_c/cisco_ios_fax_services_over_ip_application_guide/t38.html#wp1156682
> > 
> > Also, the written documentation I have shows it under
> > protocol based pass-through.
> > 
> > Which led me to ask the question, why is it working?
> Are
> > you sure that it refers to protocol based pass-through
> and
> > not NSE?
> > 
> > Regards,
> > 
> > Jason
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________
> > cisco-voip mailing list
> > cisco-voip at puck.nether.net
> > https://puck.nether.net/mailman/listinfo/cisco-voip
> > 
> > 
> 
> 
> 
> 
> 
>