Voicemail Busy Tone on CME redirect to CUE

I have a Cisco 2811 running CME 4.1 with an AIM-CUE module running CUE 3.2.3. The router has an ADSL connection to the internet , over which inbound VoIP traffic is received from a provider using G.711. Inbound PSTN VoIP calls are setup to ring a phone on reception with the following extensions (real numbers sanitised)

ephone-dn  1  dual-line
 number 2001
 pickup-group 301
 label Internal
 description Julia
 name Front Desk
 call-forward busy 8888
 call-forward noan 8888 timeout 10
 no huntstop
 hold-alert 30 originator
!
ephone-dn  8  dual-line
 number 2885 secondary 01234555002
 pickup-group 301
 call-forward busy 8888
 call-forward noan 8888 timeout 10
 no huntstop
 hold-alert 30 originator
!
ephone-dn  9  dual-line
 number 2884 secondary 01234555001
 pickup-group 301
 call-forward busy 8888
 call-forward noan 8888 timeout 10
 no huntstop
 hold-alert 30 originator

I have also created a ephone-dn for the mailbox pilot number thus

ephone-dn 11 dual-line
 number 8888

I wasn't sure i need this, but after i added it, CME would actually redirect to 8888 from external call, the only thing is that I get a busy signal when the CFNA kicks in.

I have a dial-peer setup for the mailbox number:

dial-peer voice 8888 voip
 mailbox-selection orig-called-num
 description Voicemail
 translation-profile incoming TO_CUE
 destination-pattern 0123455...
 session protocol sipv2
 session target ipv4:192.168.1.199
 dtmf-relay rtp-nte
 codec g711ulaw
 no vad

with a transfer profile of

voice translation-rule 2
 rule 1 /01234555001/ /2884/
 rule 2 /01234555002/ /2885/

under voice services i have h323 to SIP and SIP to SIP enabled as well as h450.12 and h450.3

I feel that I'm very close, but something is eluding me!