With Cisco IOS TRP(Trusted Relay Point), can register a SCCP phone to CUCME over the internet?
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For technical questions related to a Cisco Product or Technology, we encourage you to post on the Network Professionals Forum (NetPro). For your specific issue, you can go to IP Telephony forum.
Also, the complete information about the Trusted Relay Point (TRP) is documented at http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/feature/guide/TrustedFirewallControll.html .