The CID info is sent between the 1st and 2nd rings, you need to the delay the PVM at least 2 rings for the system to capture the CID data burst. Set VMS Hunt Delay #506 to 2 or 3 rings for all lines with the CID feature.
The Installation, Programming and Use document provides a complete description of what you can/can't do with the CID feature and the phones, groups, etc. It can be downloaded for free from support.avaya.com.
Happy reading!
....JIM....