[cisco-voip] Fwd: Cisco ATA Fax Confusion

[Rhodium]

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
> 
> 
> 
> 
> 
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