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

[Erick B.]

Ended up doing VG224's... moved away from the 248.

On Fri, Mar 4, 2011 at 8:25 AM, c3voip <c3voip at nc.rr.com> wrote:
> Erick,
>
> Did you get anywhere with your troubleshooting?  I am guessing the VG224's
> worked better.  I just want to know what your next steps were.
>
> -C
>
> -----Original Message-----
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Erick B.
> Sent: Friday, October 22, 2010 5:34 PM
> To: voip puck
> Subject: Re: [cisco-voip] T.38 with VG248's and MGCP PRI Gateways
>
> Still having intermittent problems with this.
>
> Have been working with Cisco with out much changes. I am going to this
> location next week so can get captures then.
>
> So far have tried every combination of MGCP settings with same results, hit
> and miss.
>
> Need protocol-based MGCP T38 for connection to SIP FAX server (First Class),
> and have VG248s set for passthrough mode (Fax Relay disabled).
>
> Inbound FAX:s work fine (very few failures) but outbound FAX calls from
> VG248-attached FAX machines are the big problem. They are brother FAX
> machines and they do not have any settings or switches to change baud rate,
> disable ECM, disable SuperG3, etc.
>
> I am taking a VG224 out with me to use along side the VG248 and move the FAX
> machines over to VG224. Going to set the 224 up as MGCP same as PSTN MGCP
> gateways since SCCP only supports NSE based T38 (same as
> VG248) from my reading of the cisco documentation and a couple posts on
> cisco forums. So it looks like SCCP is limited to NSE based T38 if both can
> only do NSE (just a guess here).
>
> The VG248s and passthough worked fine on CCM 4.1 but has been hit and miss
> ever since move to CUCM 8.02. Gateways did not change. They are also having
> issues fax'ing between FAX machines on the same VG248 and they did not have
> those issues on older CCM version.
>
>
> On Wed, Oct 6, 2010 at 9:55 AM, Chris Clouse <Chris.Clouse at cdw.com> wrote:
>> If you are still having trouble, send a diagram of the call flow for a
> working vs non-working fax and a Wireshark capture.
>>
>> 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: Erick B. [mailto:erickbee at gmail.com]
>> Sent: Tuesday, October 05, 2010 11:52 PM
>> To: Chris Clouse
>> Cc: voip puck
>> Subject: Re: [cisco-voip] T.38 with VG248's and MGCP PRI Gateways
>>
>> Yea, have tried these and combinations and still have hit and miss FAXs.
> Where some FAX machines can call most numbers fine but not others.
>>
>> Let me try to take off the t38 force and leave fxr-package as not default
> and see if that makes a difference (thats about the only combo I haven't
> tried yet).
>>
>> No ATAs, just FAX's off of VG248s.
>>
>> On Tue, Oct 5, 2010 at 9:41 PM, Chris Clouse <Chris.Clouse at cdw.com> wrote:
>>> 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
>>> _______________________________________________
>>> cisco-voip mailing list
>>> cisco-voip at puck.nether.net
>>> https://puck.nether.net/mailman/listinfo/cisco-voip
>>>
>>
>
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