I just run into an issue with CIPC and CDP packets advertised by the IP Communicator.
It looks like the CIPC 7.0.5 comes with CDP driver version 1.0 and CIPC 7.0.6 comes with CDP driver 1.0(2). Both of these version do not seem to send out CDP packets when used with Windows XP. But when you install CIPC 7.0.3 it comes with CDP driver 2.0 and it works correctly.
I just wanted to find out if I'm the only one who experienced this. This is an issue with you use CIPC with CER.