Amount of phones per platform have nothing to do with PDVMs
Review this link to get the answer as you do not mention which CME version you're using
Cisco Unified CME and Cisco IOS Software Version Compatibility Matrix
http://www.cisco.com/en/US/partner/docs/voice_ip_comm/cucme/requirements/guide/33matrix.htm
Also, this is a video over IP section of CSC. Please post your questions in the right place.
HTH
java
if this helps, please rate
www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate