I have a question about our ASA though if anyone can answer it. We have to move from an ASA 5510 to a 5520 due to the 100 UC proxy-phone license limitation on the 5510 (even though we have only 70 proxy phones deployed it appears that a UC license is taken up for each TFTP server configured on the phone - primary and secondary). When I configured the 5520 I can register new phones no problem. None of the existing phones will register until the CTL file is manually deleted on each phone. Is there a way to seamlessly migrate to the 5520? Such as using the same certs, CTL file etc.. on the 5520? When I configured it it generated it's own self-signed key and CTL file. I did import the certificates from CUCM...
