Cisco TSAPI client configuration hangs

Using Windows XP sp3 and Cisco Unified Communications Manager 7.0.1, I find that clicking Configure on the Phone and Modem Options in Control Panel hangs on some machines.
Attempting to restart the Telephony service indicates the Remote Access Connection Manager service is a dependency.

Unfortunately, I have not researched the implications of disabling this service as of yet but doing so and setting Telephony to start automatically seems to allow configuration appropriately.