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Cisco "External Phone Number Mask" assistence needed

We are running a Cisco CM 4.0 phone system. We recently added another site office to outr network that is in another state. That remote office is using a Cisco 881 voice gateway router with two VPN tunnels for the network VLAN and the Voice VLAN. That all seems to work just fine. However, we would like the caller ID from that remote office to have a local presence. I've tried using the "External Phone Number Mask" field in call manager but it still just shows our main line at the corporate office for the caller ID. It's important that we can spoof the caller Id for to show a local presence for that site office as well as for any potential 911 calls. Any help on this would be greatly appreciated.

Thansk!
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We do not have any analog lines there - only the internet circuit as we are running this remote site office as bare bones as possible. So if the tunnel goes down it won't really matter.  In the Route Pattern, it appears that "Calling Line ID Presentation" and "Calling Name Presentation" are all set to default. In the Gateway, I see our main line number in the "Caller ID DN". If that is left blank, does it then pick it up from the individual line configuration from the "external phone number mask" field ?
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Additional info: I fear that the telco on this might be my stumbling block. It's a T1 PRI circuit through Cox at the headquarters location where the Call Manager servers are.
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The PRI T1 comes into a Cisco 2811 voice gateway router
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No it is not. The number to be spoofed is a virtual vanity number in the same area code that the out of state remote office is in. That number is being forwarded to one of our DiD's via the telco.
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