How is the above document helpful and at rev.2? Here's a list of 20 white papers, the answer is somewhere in there, possibly?

So is this the solution for enterprise customer with 5000 phones? Manually copy and paste devcie name from Call Manager for 5000 users?

Baron,Did you find a solution? I have a customer with the same problem - ports going out of service for few seconds while callers hear screaching sound or dead air during that time.

Check this:http://www.cisco.com/en/US/customer/docs/voice_ip_comm/unity/5x/troubleshooting/guide/ex/5xcutsg170e.html#wp1049561and also make sure that you have the correct IP Address or the full FQDN in commserver\cscoserv\ciscopca\web.xml under unity...

need to re-run it:-)