Cisco 857 - Port forwarding for a range?

[#Chri5#]

I've got a 857 up and running. I have some port forwards in place eg:

ip nat inside source static tcp x.x.x.x 5060 interface dialer0 5060

I now need to add port forwards for 1024 to 65535 UDP. Is it possible to add them as a block? Can you specifiy a port range in the ip nat command?

Also, can you restrict what IPs are able to access the port forward? For instance, I might want to say open the above port group but only allow traffic originating from 1.1.1.1 through.

Thanks!

 

[#Chri5#]

RTP / SIP.

I think that having 5060 open for the SIP siginalling is enough but I want to do some testing to make sure.