Exchange UM integration to CUCM 4.x using IP-IP GW

A few days ago I printed the configuration for an IP-IP GW to integrate OCS with CUCM(all versions). I wanted to expand on this a little to include the configuration for Exchange UM to Cisco Unified Communications Manager 4.x(Callmanager). This is a very similar configuration and if you are using CUCM 4.x you could use the same IP-IP GW (Cisco router) to connect to the PSTN, Exchange and OCS, depending you load requirements of course. Depending on the dial plan configured in Exchange your configuration will vary for your dial peers. It is always best to match your extension length used in CUCM and the extension length in Exchange UM dial plan. The example below is based on 10 digits. Out bound dial peers to CUCM are required for the play on phone feature. This is a straightforward configuration in CUCM with the IP-IP GW configured as a H323 gateway. No MTP’s are required. Configuration unrelated to IP-IP GW has been removed for clarity. IOS version 12.4.15xz is required for this configuration.

!
voice service voip
no notify redirect ip2ip
allow-connections h323 to h323
allow-connections h323 to sip
allow-connections sip to h323
allow-connections sip to sip
supplementary-service media-renegotiate
supplementary-service ringback h225-info
fax protocol t38 ls-redundancy 2 hs-redundancy 2 fallback none
h323
emptycapability
no h225 timeout keepalive
h245 passthru tcsnonstd-passthru
sip
midcall-signaling passthru
bind control source-interface FastEthernet0/0
bind media source-interface FastEthernet0/0
!
!
!
!
dial-peer voice 103 voip
Description incoming dial peer for Exchange numbers
incoming called-number 555111110[12]
dtmf-relay h245-alphanumeric
codec g711ulaw
!
dial-peer voice 111 voip
description Dial-Peer To Exchange Subscriber Access
preference 1
destination-pattern 5551111100
session protocol sipv2
session target ipv4:X.X.X.X
session transport tcp
dtmf-relay rtp-nte
codec g711ulaw
fax rate disable
fax protocol pass-through g711ulaw
no vad
!
dial-peer voice 112 voip
description Dial-Peer To Exchange AA
preference 1
destination-pattern 5551111101
session protocol sipv2
session target ipv4:X.X.X.X
session transport tcp
dtmf-relay rtp-nte
codec g711ulaw
fax rate disable
fax protocol pass-through g711ulaw
no vad
!
dial-peer voice 113 voip
description to Callmanager 4.X FIRST SUBSCRIBER
preference 1
destination-pattern 1[2-9]..[2-9]......
session target ipv4:X.X.X.X
dtmf-relay h245-alphanumeric
codec g711ulaw
no vad
!
dial-peer voice 114 voip
description to Callmanager 4.X SECOND SUBSCRIBER
preference 2
destination-pattern 1[2-9]..[2-9]......
session target ipv4:X.X.X.X
dtmf-relay h245-alphanumeric
codec g711ulaw
no vad
!
!

Please post your comments and questions.