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ATA187 Fax Failure

jeremiah88
Level 4
Level 4

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.

4 Replies 4

Jeff Van Houten
Level 5
Level 5

Did you add path-mtu-discovery to the router?

Sent from Cisco Technical Support iPad App

jeremiah88
Level 4
Level 4

No, sorry, have not used that command, can you explain?

Sent from Cisco Technical Support iPhone App

mbroberson1
Level 3
Level 3

Just curious if you ever got this resolved and what you did to fix? I may be seeing a similar issue.

 

Regards

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.