FIX** - Can I use my Cisco CallManager Express IP Phone system?

Yes, here is a known working configuration to help you get started on configuring your CCME to work with your phone service:

!
enable secret xxxxxx
!
no aaa new-model
clock timezone xxx -x
no network-clock-participate slot 1
no network-clock-participate wic 0
ip cef
!
!
! If you plan to use session target dns: in your dial peers
! you will need to enter a valid name server here (dns)
ip name-server x.x.x.x
!
!
voice service voip
! Identify SIP as your primary voice service sip
! Bind SIP media and control traffic to F0/0
bind control source-interface FastEthernet0/0
bind media source-interface FastEthernet0/0
!
voice translation-rule 1
rule 1 /9911/ /911/
rule 2 /9411/ /411/
!
! Replace xxx with your local area code
voice translation-rule 2
rule 1 /9xxx+/ /xxx/
!
! Matching 7 digit dialing
voice translation-rule 3
rule 1 /9+/ //
!
! Matching 11 digit long distance
voice translation-rule 4
rule 1 /91+/ /1/
!
! Matching International Dialing
voice translation-rule 5
rule 1 /9011+/ /011/
!
! This rule is used to convert the incoming 11 digit number to a four digit extension
voice translation-rule 6
rule 1 /1xxxxxxxxxx/ /xxxx/
!
! Translate any extension using this SIP trunk to the full 11 digit account number
! Without this outgoing calls will fail voice translation-rule 7
rule 1 /1.../ /1xxxxxxxxxx/
!
! Translation Profiles configured for ease of identification in the dial peers
! Translation is configured for the calling party to translate the extension to
! the full 11 digit SIP trunk account number
voice translation-profile Services
translate calling 7
translate called 1
!
voice translation-profile Local10
translate calling 7
translate called 2
!
voice translation-profile Local7
translate calling 7
translate called 3
!
voice translation-profile LongDistance
translate calling 7
translate called 4
!
voice translation-profile International
translate calling 7
translate called 5
!
voice translation-profile Incoming
translate calling 7
translate called 6
!
!
interface FastEthernet0/0
ip address x.x.x.x 255.255.255.x
speed 100
full-duplex
!
ip route 0.0.0.0 0.0.0.0 x.x.x.x
!
no ip http server
!
!
dial-peer voice 10 voip
translation-profile outgoing Services
destination-pattern 9[49]11
session protocol sipv2
session target dns:server.vtnoc.net
dtmf-relay rtp-nte
codec g711ulaw
!
dial-peer voice 11 voip
translation-profile outgoing Local10
destination-pattern 9xxx[2-9]......
session protocol sipv2
session target dns:server.vtnoc.net
dtmf-relay rtp-nte
codec g711ulaw
!
dial-peer voice 12 voip
translation-profile outgoing Local7
destination-pattern 9[2-9]......
session protocol sipv2
session target dns:server.vtnoc.net
incoming called-number .
dtmf-relay rtp-nte
codec g711ulaw
!
dial-peer voice 13 voip
translation-profile outgoing LongDistance
destination-pattern 91[2-9]..[2-9]......
session protocol sipv2
session target dns:server.vtnoc.net
dtmf-relay rtp-nte
codec g711ulaw
!
dial-peer voice 14 voip
translation-profile outgoing International
destination-pattern 9011T
session protocol sipv2
session target dns:server.vtnoc.net
dtmf-relay rtp-nte
codec g711ulaw
!
dial-peer voice 15 voip
description Voicemail
destination-pattern *123
session protocol sipv2
session target dns:server.vtnoc.net
codec g711ulaw
!
dial-peer voice 16 voip
description Set Caller ID to Anonymous for one call
destination-pattern *67
session protocol sipv2
session target dns:server.vtnoc.net
dtmf-relay rtp-nte
codec g711ulaw
!
dial-peer voice 17 voip
description Unblock CallerID information
destination-pattern *82
session protocol sipv2
session target dns:server.vtnoc.net
dtmf-relay rtp-nte
codec g711ulaw
!
dial-peer voice 18 voip
description Call Back The last incoming caller
destination-pattern *69
session protocol sipv2
session target dns:server.vtnoc.net
dtmf-relay rtp-nte
codec g711ulaw
!
dial-peer voice 19 voip
description Broadcast Menu/Record Broadcast Messages
destination-pattern *400
session protocol sipv2
session target dns:server.vtnoc.net
dtmf-relay rtp-nte
codec g711ulaw
!
!
sip-ua
authentication username 1xxxxxxxxx
password yourpwd
no remote-party-id
mwi-server dns:server.vtnoc.net expires 300 port 5060 transport udp
registrar dns:server.vtnoc.net expires 300
sip-server dns:server.vtnoc.net
!
!
gatekeeper
shutdown
!
telephony-service
load 7960-7940 P00303020214
max-ephones 10
max-dn 20
ip source-address x.x.x.x port 2000
time-zone 13
voicemail *123
max-conferences 4 gain -6
call-forward pattern .T
moh flash:genericmusiconholdfile.au
transfer-system full-consult
transfer-pattern .T
secondary-dialtone 9
!
!
ephone-dn 1 dual-line
number xxxx no-reg primary
!
ephone 1
mac-address xxxx.xxxx.xxxx
button 1:1
!
ephone-dn 2
number 1xxxxxxxxxx
call-forward all xxxx
!