I assume you're using CUCM and want to put the CUBE in place to interface with the Service Provider. When you do that it means that as far as the Service Provider is concerned all voice calls are being sourced from the IP of the CUBE. Anyone in the SP network would see only the IP address and port range of the CUBE.
This means you could put a firewall in front of this device and only allow inbound voice calls to the CUBE, and disallow all voice calls to any non CUBE IP from the outside world. You could also put digest authentication between the CUBE and the Service Provider so only calls that use the agreed upon authentication can succeed.
If the Service Provider allows, it would also be possible to setup TLS using certificates between the CUBE and the SP, but I don't believe this is as common. It would involve some work from the provider to trust your CUBE certificate, and you to configure the CUBE to trust theirs.
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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CUCM Database Replication is an area in which Cisco customers and
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