You do not need dail-peer pointing to CME on CME gateway..You need to configure CME as h323 GW in call manager. Then configure the CME like following
allow-connections h323 to h323
supplementary-service h450.12
! add a dial peer to point to the call manager
dial-peer voice 555 voip
description points-to-CCM
destination-pattern 2000
session target ipv4:192.168.0.1
It should work fine.