[cisco-voip] T.38 with VG248's and MGCP PRI Gateways

[Nick Matthews]

It actually should be enable by default:

no mgcp fax t38 inhibit (default)

On Tue, Oct 5, 2010 at 9:36 PM, Erick B. <erickbee at gmail.com> wrote:

> Is the FXR-package the NSE one?  I set that so it wasn't a
> default-package but is still enabled.
> What command is for the other method?
>
> All the T1s are clean to (no errors, no slips, etc).
>
> I'm just coming into this now as a support guy trying to clean this up
> and get things working. Just want outbound FAX's to PSTN working
> reliably out of these FAX machines attached to the VG248 which is
> mostly where the problem is.
>
> Other thought is maybe to route the outbound FAX's out a less used PRI
> (last in line) and set that gateway up for passthrough along with
> VG248s and make a fax route list, CSS, etc that is assigned to the FAX
> machines.
>
> Thanks for your help.
>
> On Tue, Oct 5, 2010 at 5:16 PM, Nick Matthews <matthnick at gmail.com> wrote:
> > Odd mix - MGCP supports protocol and NSE based T38 switchover.  A SIP fax
> > server will support protocol based T38 switchover only.  A VG248 doesn't
> > support protocol based switchover.
> >
> > Your best bet is using NSE based between the VG248 and MGCP gateway, and
> > protocol between MGCP and fax server.  You can configure both, and in
> theory
> > should be able to make those fax calls.  I would not normally recommend
> > enabling both methods.  I also wouldn't expect for faxes between the
> VG248
> > and the fax server to be successful if that was a goal.
> >
> > -nick
> >
> > On Tue, Oct 5, 2010 at 5:52 PM, Erick B. <erickbee at gmail.com> wrote:
> >>
> >> Hi,
> >>
> >> Anyone ever do T.38 faxing with VG248s and MGCP PRI gateways?  Have
> >> client that needs to use T38 for a SIP FAX Server they have, but
> >> outbound calls to PSTN from Brother FAX Machines attached to VG248s
> >> are intermittent.  Sometimes they work, sometimes they don't. The
> >> Brother FAX machines have no way to change Baud rate or ECM settings,
> >> etc. They had no problems with passthrough (before the FAX Server was
> >> upgraded to SIP).
> >>
> >> Incoming FAX's work fine (a majority - very little issues reported).
> >> Most of these go to FAX server and some go directly to the FAX
> >> machines on the VG248's.
> >>
> >> The VG248 ports are set to T.38 peer to peer, and we've tried various
> >> MGCP T38 settings on the gateway with TAC's help but still having
> >> problems with outbound FAXs.
> >>
> >> Tried setting gateways to force t38 (mgcp fax t38 gateway force),
> >> tried removing the fxr-package as default (not needed for VG248 per
> >> TAC), and set the ls and hs redundancy settings to 0 (VG248 doesn't
> >> support redundancy), tried with with mgcp fax rate set to 9600 baud,
> >> ECM off on MGCP gateway, etc. Reset MGCP with these changes each time.
> >>
> >> Anyone know how to disable VG248 from using Passthrough mode? The port
> >> is set to T.38 peer to peer but when I try changing the Passthrough
> >> setting to "voice only - no passthrough" then no FAXs work at all with
> >> the FAX machine attached to the VG248 port (I bounced the port after
> >> the change also).
> >>
> >> Call Manager version is 8.02 with latest 12.4.24T IOS on gateways.
> >>
> >>
> >> Ideas anyone?
> >>
> >> Thanks, Erick
> >> _______________________________________________
> >> cisco-voip mailing list
> >> cisco-voip at puck.nether.net
> >> https://puck.nether.net/mailman/listinfo/cisco-voip
> >
> >
>
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