Hey Shuem, That is correct. The easiest way to bypass the NAT Exemption (NAT 0) for a single host when using network like that is to put a deny statement for the single host in the network that should still NAT. I would also recommend upgrading that ...

Would you be able to share some of the ASA config? I am assuming the ASA is doing DHCP for the Outside interface so that the Router can provide it an IP address is that accurate? How is the Second Router getting its IPs? Is it through DHCP on the int...

Those are the configurations in relation to SIP and what to do with the SIP traffic once permitted. The ASA inherently blocks traffic, unless no ACL is applied and you are going from a higher security zone to a lower security zone. If SIP is not expl...