Intercluster Trunk through NAT

[Cathy Mangogna]

I have an CUCM 8.6.2 running in a NATed environment (CUCM and all subscribers in private IP space) with a static NAT set for the CUCM itself. Is there a way to natively trunk to a CUCM operating on live/public IP space? I initially started looking to build SIP trunks but do not have STuN server available and have been directed that I cannot add any additional hardware or unapproved software to the network. Will an Intercluster trunk connect and route successfully to the public facing NAT address.

[Aman .]

For a production environment and where the call flow is high; You should use a CUBE with "flow through" configuration.

If you just want to test whether there is any way to make it work, make a SIP Trunk (to CUCM on public IP) and check MTP required. Put only software MTP in the MRGL that is assigned to the SIP Trunk, this will force all media to go through CUCM servers.

But your Network should still be able to NAT udp packets , otherwise how the packets will be routed ?

Not Tested, so correct me if I am wrong :).