Knowledge sharing, I just deployed CUAC Advanced 12.0 “Pub and Sub” with CUCM 11.5 I used Cisco CUAC Admin guide for configuration in CUAC and CUCM, after all servers is up and running I stuck with issue that I have more than 1500 CTI ports to sync between CUAC and CUCM, once I start sync it was working fine with around first 350 Ports it’s shown as registered in CUCM, but once I exceed this number all other ports start to be in unregistered and none status in CUCM, I try all the troubleshooting documents in Google but it’s not working, I check the logs in CUCM and CUAC, what I found in CUAC logs that “Error cannot reserve media” include the name of CTI ports that in None OR unregistered status, I try to uninstall TAPE and Install it again but I don’t guess this is related because some ports already registered and I restarted CTI Manager service in all nodes.
So after 3 days stuck in this issue, I uninstall TAPE from CUAC Pub and Sub, and download TAPE from CUCM, in the installation process for TAPE in CUAC I notice that there is Media driver allocate UDP ports from 2xxx to 21xxx “I don’t remember that exact number” I ready the comments regarding this “ that each 4 UDP ports will used for one CTI Ports” I checked CUAC Admin Guide and I can see that UDP ports for Media start from 50000 to 52000, and I change it in TAPE installation to this ports and working 100%.
This Document is not official answer and maybe there is other work around for this issue, but it’s working with me like this.
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