Customer requirement is to have a physical Cisco IP Phone with SIP firmware off net, to register with CME7.0 in the network. They do not want to establish any vpn to acheive this.
My first question is on the CME, are there any major configuration differences when registering SIP phones in comparison to SCCP Phones? I am assuming all you have to do is make sure you have the SIP firmware in flash and tftp.
Second question is what ports do I have to allow from the public internet into the NAT IP for CME?
I am also going to have a SIP trunk to the service provider. What ports should I allow from the service SIP Proxy server?