[cisco-voip] SIP trunk fax troubleshooting

[Nick Matthews]

Make sure whatever the VGC is also configured for protocol based fax
passthrough.  Common mistake there.  In the debugs if faxing is trying to
work correctly you will see a reinvite come in for G711 with echo
cancellation off.  You will want to see that invite make it's way to the
gateway and be accepted there. If there is an mtp it needs codec
passthrough configured.

If it's not switching over (reinvite), it's likely configuration. If it is
switching and still not working, it's at L7 (fax machine). L7 fax machine
problems aren't fun to troubleshoot, hence fax server.

-nick

On Tue, Jul 31, 2012 at 12:18 PM, Robert Kulagowski <rkulagow at gmail.com>wrote:

> On Tue, Jul 31, 2012 at 2:44 AM, Divin John <dijohn at cisco.com> wrote:
> > Do you have debugs from the CUBE? Are MTPs involved in the call flow?
>
> I have lots of debugs. Are there any in particular that I should be
> looking at?
>
> As far as MTP, I don't believe so. Everything is SIP.
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