I have a cu trying to run latest version of CIPC (same problem confirmed with previous versions as well), during testing we experienced only incoming (one-way) voice. After troubleshooting and isolating the issue it shows that once Microsoft Firewall (ISA) Client is installed, that breaks the CIPC. Just disabling FW-client service does not help.
Has anyone seen this issue, and if so, is there a solution? My knowledge of the ISA-client is very limited. :)