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CM5.1 SIP Endpoints

I'm looking for guidance on configuring SIP endpoints in CM5.1 over the Internet not using a VPN. I can get the endpoint to pull a configuration and get dialtone, but it still says registering. There are CTL errors in the network messages list.

Endpoint is 7961 phone.

Firewall is ASA with the appropriate ports open.

Thank you,

Jon

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