[SIPForum-discussion] FAX Issue in VoIP

[murali shankar]

Hi All,

       Thanks for the Response. Is there any specific configuration that
needs to be enabled on a Nextone switch for FAX ?If so enabling that will
affect any voice calls made through that endpoint?

Regards,
Murali Shankar.E

On Tue, Sep 14, 2010 at 6:15 PM, Kevin P. Fleming <kpfleming at digium.com>wrote:

> On 09/13/2010 09:42 AM, Broussard, Dan wrote:
> > I have found that G.711 does a better job than T.38
> >
> >
> >
> > FAX devices that use V.34 to achieve 28800 bps and 36600 bps
> > transmission rates are often referred to as Super Group 3 devices.
> > Customers serviced usually can achieve 28800 bps and 36600 bps
> > transmission rates using G.711.  They cannot achieve these transmission
> > rates using T.38.
>
> That's because there are very few T.38 gateways deployed in carrier
> networks that support V.34 FAX. Until recently, the procedures for
> properly handling T.38 call setup when both V.34 and non-V.34 endpoints
> are involved weren't even fully specified... but the
> soon-to-be-published T.38 2010 recommendation addresses this issue
> (among many others) and we hope to see deployment of V.34-capable
> gateways increase in the near future.
>
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> skype: kpfleming | jabber: kfleming at digium.com
> Check us out at www.digium.com & www.asterisk.org
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