09-15-2012 01:25 PM - edited 03-16-2019 01:13 PM
Hi all, I have a new install of CUCM 8.6.2(a) and I set up ATA 187's for Faxing. I have them set to basically the default config, using T38 Protocol, and I have the T38 Protocol set on my PSTN gateway. The issue I am having is that outbound faxes often fail, sometimes it works, but when it does it is only 1 page faxes. Inbound faxes, often the first page is recieved, and the subesquent pages either never come in, or come in much later at random times. I changed everything to pass-through mode, and reset, but that did not make a difference, I had the same issue. Any ideas? I never had these issues with ATA186's.
09-15-2012 08:27 PM
Did you add path-mtu-discovery to the router?
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09-15-2012 09:30 PM
No, sorry, have not used that command, can you explain?
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11-16-2014 11:09 AM
Just curious if you ever got this resolved and what you did to fix? I may be seeing a similar issue.
Regards
11-17-2014 06:51 AM
In my experience, on a router acting as an H.323 gateway and using T.38, you need to have the following command in the config.
ip tcp path-mtu-discovery
Doesn't hurt to try.
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