[cisco-voip] Cisco RightFAX ECM fax fails

[Nick Matthews]

It's pretty hard to test that - you could set up a few remote numbers
and do the capture on the other end of the PSTN to see if it matches
your audio as it leaves your site.  If it doesn't there is degradation
of audio quality through the Verizon network.  Good luck with that, if
that ends up being the (fairly likely) case.

When faxing doesn't work it's usually because it's not in fax mode
about 95% of the time.  The other 5% of the time is because of line
conditions, and when it's not T1 slips, it's a huge pain.

-nick

On Fri, Jun 10, 2011 at 4:22 PM, Mike Lydick <mike.lydick at gmail.com> wrote:
> Verizon will not support T38, yet. We are using g711fax pas-through.
> It's definitely related to ECM, we are able send with this off, but failed
> with it on. We have enable packet marking on the server with in Rightfax,
> but with version 9.3 this was not working if I recall correctly. We are
> running 9.4 and Opentext recommended it on this version.
>
> Best Regards,
>
> Mike Lydick
>
>
>
>
> On Fri, Jun 10, 2011 at 3:59 PM, Nick Matthews <matthnick at gmail.com> wrote:
>>
>> You could try turning on T.38 redundancy.  If you see problems with
>> ECM on with T.38 redundancy it's probably not a QoS problem.  I would
>> probably confirm the redundancy via packet captures as I haven't tried
>> T.38 redundancy over SIP providers before, not sure if they have any
>> restrictions.
>>
>> -nick
>>
>> On Thu, Jun 9, 2011 at 12:13 PM, Mike Lydick <mike.lydick at gmail.com>
>> wrote:
>> > We can reproduce failures with an issue with ~20% of our outbound fax
>> > calls,
>> > if Right fax SR140 is set to use ECM. I believe this is an indication
>> > that
>> > the far end is lossy and we must be loosing some packets as well. Anyone
>> > have similar experience with Rightfax ECM over SIP trunks that was not
>> > related to QOS?
>> >
>> > Best Regards
>> >
>> > Mike Lydick
>> >
>> > o
>> > _______________________________________________
>> > cisco-voip mailing list
>> > cisco-voip at puck.nether.net
>> > https://puck.nether.net/mailman/listinfo/cisco-voip
>> >
>> >
>
>