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Registering CIPC Against CUCM Server Behind DNAT

Posted on 2013-01-30
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Last Modified: 2013-02-02
We've a partner running approx. 20 CIPC (8.6.2.0) devices within their network that need to register with our CUCM cluster (6.1.2); unfortunately their network uses the same address space as our servers.

We're able to get CIPC to talk to our TFTP services by configuring CIPC with the DNAT address, but the CTL downloaded contains the internal IP of our CUCM boxes. Any idea how we can configure CUCM to provide different IPs based on device IP, device pool or some other identifier.

Thanks in advance,
Jason
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Question by:jmorourke80
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agonza07 earned 500 total points
ID: 38838533
Host a local TFTP server and run modified CTL and SEP files off of it.

You'll have to manually modify the files, but if its just 20 it shouldnt be that bad.
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by:jmorourke80
ID: 38841128
Thanks agonza. I'd thought of that previously, and set up a TFTP server to test it out but CIPC was always trying to connect via TCP rather than UDP at first, and when it finally switched over to UDP all I was seeing on my packet capture was malformed packets. At this point I gave up, thinking Cisco must've been doing something fancy for their "TFTP" and started looking for other solutions.

Did I give up too soon? Is there someway to get these cnf.xml etc. to download successfully from a standard TFTP server?
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by:jmorourke80
ID: 38841242
Okay so after a closer look at the packet captures it looks like CIPC is using HTTP to fetch files from the TFTP server. Who knew, eh?

I'm back on track to create the separate "TFTP" server (using IIS).
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Expert Comment

by:agonza07
ID: 38841937
I like Klever Pumpkin.

Point your CIPC to it and it'll tell you the exact files it's requesting. The. Using the same program request them from your CCM. modify them and post them.
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