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

[Chris Clouse]

I think this will do what you are looking for.  Be aware that mgcp fax t38 gateway force will break ATA's in your environment.

mgcp package-capability fxr-package
mgcp default-package fxr-package
no mgcp t38 fax inhibit
no ccm-manager fax protocol cisco
no mgcp fax t38 ecm
mgcp fax t38 gateway force

Christopher  Clouse
Network Voice Engineer

CDW Advanced Technology Services
7145 Boone Ave N, Suite 140, Brooklyn Park, MN 55428
Single Number Reach: 763.592.5887
chris.clouse at cdw.com



-----Original Message-----
From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Erick B.
Sent: Tuesday, October 05, 2010 4:52 PM
To: voip puck
Subject: [cisco-voip] T.38 with VG248's and MGCP PRI Gateways

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
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