You can use translation rule to strip the first 5 digits on the router/gateway itself.
Or, you can send all 10 digits to Callmanager and strip the first 5 digits via gateway config in CCM. In the gateway config, you have a setting for Significant Digits, and you have to set that to 5 and CCM will consider only the last 5 digits for the incoming call.
What gateway are you using, MGCP/H323 PRI,CAS,FXO ??
For inbound calls, you do not need to do anything with route group/list (which are used for outbound call routing). Have the voip dial-peers on your h323 gateway send all 10 digits to CCM, and on CCM h323 gateway config set Significant Digits to 5.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
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