Hi,
You will need an IP-IP gateway as stated above
Please see below sample configuration which i beleive to be relevant to your situation
voice service voip
media flow-around
allow-connections h323 to sip
allow-connections sip to h323
voice class codec 99
codec preference 1 g711alaw
codec preference 2 g711ulaw
voice class h323 1
h225 timeout tcp establish 3
call preserve
sccp local GigabitEthernet0/0
sccp ccm X.X.X.X identifier 2 version 7.0
sccp ccm X.X.X.X identifier 1 version 7.0
sccp ip precedence 3
sccp
!
sccp ccm group 1
bind interface GigabitEthernet0/0
associate ccm 1 priority 1
associate ccm 2 priority 2
associate profile 2 register XCODE
associate profile 1 register MTP
!
dspfarm profile 1 mtp
codec g711ulaw
maximum sessions software 100
associate application SCCP
dial-peer voice 2 voip
description *INBOUND FROM SP*
media flow-around
session protocol sipv2
incoming called-number .
voice-class sip asserted-id pai
dtmf-relay rtp-nte
codec g711ulaw
no vad
!
dial-peer voice 10 voip ** Outbound dial-peer to SIP Trunk
description -- Outbound to SP
translation-profile outgoing egressTranslation
destination-pattern 0T
session protocol sipv2
session target ipv4:X.X.X.X
codec g711ulaw
voice-class sip asymmetric payload dynamic-codecs
voice-class sip asserted-id pai
voice-class sip early-offer forced
voice-class sip error-code-override options-keepalive failure 500
dtmf-relay rtp-nte
no vad
dial-peer voice 201 voip ** customers DiD range to IPPBX
destination-pattern XXXXXXXXXX
media flow-around
codec g711ulaw
voice-class h323 1
session target ipv4:X.X.X.X
dtmf-relay h245-alphanumeric
no vad
This is a cutdown version of an IP-IP gateway however i hope it to be a good starting point for you.
Scott
