Try this:
voice service voip
sip
registrar server
!
!
!General SIP Configuration
voice register global
mode cme
source-address port 5060
max-dn 12
max-pool 12
timezone 21
time-format 24
date-format D/M/Y
call-forward system redirecting-expanded
create profile sync 0834091551485351
!Configuration for your client
voice register dn 2
number 10
allow watch
name
no-reg
label
mwi
!
voice register pool 2
id mac 1111.2222.3333
number 1 dn 2
dtmf-relay rtp-nte
username password
codec g711alaw
!
!
!If some commands are not understood from your CCME, upgrade the IOS.
