The basics of how to eliminate the access code for outbound calls in PBX modeis describe well at https://supportforums.cisco.com/docs/DOC-9787.
Assuming you start with a basic configuration via Cisco Configuration Assistant, you will still need to modify how the 6XXX pattern, used for transferring calls directly to voicemail is handled, as well as fixing the MWI codes in CUE.
Per the supportforums, I've found using rule 2 below to remove the trailing star from the standard three digit extension works fine applied to dial-peer 2000 associated with the CUE pilot number. The problem is now when using the 6XXX* pattern to send calls to voicemail, the redirecting number simply becomes 6XXX and CUE replies with a "Sorry. There is no mailbox..." prompt.
To remove the 6 and star if there, and then just the star if the leading 6 isn't there, you can change the translation-rule like below (insert rule 1):
voice translation-rule 2222
rule 1 /^6\(...\)[*]/ /\1/
rule 2 /\(.*\)[*]/ /\1/
To fix the CUE's ability to light and extinguish MWI:
service-module integrated-Service-Engine 0/0 session
se-10-1-10-1(config)#ccn application ciscomwiapplication aa
se-10-1-10-1(config-application)# parameter "strMWI_OFF_DN" "A8001"
se-10-1-10-1(config-application)# parameter "strMWI_ON_DN" "A8000"