I have a customer who has a typical setup, CCM (6.x) sitting behind a 2811 Voice Gateway, the voice gateway also serves his internet access providing overload nat.
What they are looking to do is provide remote IP Phones, ideally across the internet, but without VPN.
I found the 2811 has some form of Session Border Controller in it, but not sure if it will work in this situation.
As the CCM has an internal private IP, so will the outside IP Phone.
Is there a tech note on doing this? SCCP or SIP? Has anyone managed to get it working?
P.S. I'm aware of the issues running SCCP and SIP through NAT by just mapping ports.