Network Address Translation (NAT) is a function that allows multiple devices to share the same
public, routable IP address to establish connections over the Internet. NAT is present in many
broadband access devices to translate public and private IP address.
Halo series phones can work with Rport type of NAT.
Halo series phones support rport described in RFC 3581. It allows a client to request that the
server sends the response back to the source port from which the request came.
Rport feature depends on support from a SIP server.
The following table lists the parameter you can use to configure rport.