well, my experience with T.38 is that we switched it off within our network and now use passthrough instead :P.
the reason: - new fax machines that defaults to v.34 and on some you cannot disable SG3 at all... just imagine what pain it is to produce a how to disable V.34 manual for every damn fax machine - a variety of T.30 <> T.38 mapping issues, broken GWs/ATAs that don't do a correct encoding/decoding expectantly when it comes to a terminating fax server that doesn't send a proper EOP... God save our souls... - our network has very low jitter - up to 40 ms , so passthrough works perfect - bandwidth become cheap :=) - and ... don't even remember any fax issues after shutdown T.38 i could go with the list... but i suppose you have better things to do :P T. On Thu, Oct 22, 2009 at 9:29 PM, Gabriel Kuri <gk...@ieee.org> wrote: > AFAIK T.38 v2 supports a max speed of 14.4 anyhow, so that's the max > speed you'll ever see in the SDP. T.38 v3 supposedly supports v.34 > speeds, however no one that I've seen has implemented it yet - not sure > it's even an official standard? > > Yes, in my experience, v.34 capable FAXes do not properly negotiate down > to 14.4 speeds, we've always had to disable v.34 (or whatever the option > is called on your particular make/model to force it down to 14.4 or > slower speeds). We use the Cisco/Linksys ATAs - I've heard there's > better ATAs out there that properly negotiate the FAX down to 14.4 on > the T.30 side of the connection, but never had a chance to play with them. > > I'd certainly be interested to hear anyone's experience with T.38 > reliability and various combinations of FAX machines and make/model of > ATAs. > > Gabe > > Kristian Kielhofner wrote: > > Gabe, > > > > I don't think any of them are plus the T.38 SDP tells me the bitrate > > is 14400, certainly not V.34 speed. > > > > Are you saying the machine even trying to negotiate V.34 poses a > problem? > > > > On Thu, Oct 22, 2009 at 2:16 PM, Gabriel Kuri <gk...@ieee.org> wrote: > >> Out of curiosity, is it a Super G3 (ie v.34) capable FAX? We've had > >> nothing but intermittent problems with Super G3 FAXes over T.38, unless > >> v.34 is strictly turned off on the machine. > >> > >> Gabe > >> > > > > > _______________________________________________ > FreeSWITCH-users mailing list > FreeSWITCH-users@lists.freeswitch.org > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users > UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users > http://www.freeswitch.org >
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