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NAT for Connection Address of SDP

I have a cisco 2621XM with IOS 12.3.

Is there a command for the cisco router to NAT the connection address within the SDP packet?

Is there a command for setting a static NAT with a large port range for RTP? Right now I have to dedicate a whole public IP addy for RTP since I don't know how to do specify a range.

If I have the following scenario.

WAN Port

fa0/0

10.10.10.1

LAN Port

Fa0/1

192.168.1.1

VOIP Server(Interactive Intelligence, Handles all SIP messages)

IP 192.168.1.50

VOIP Media Server(Handles all RTP Traffic)

IP 192.168.1.100

Current NAT setup

ip nat inside source list NAT_Addys interface fa0/0 overload

---------NAT Overload for all my LAN devices

ip nat inside source udp 192.168.1.50 5060 fa0/0 5060

---------Static NAT for SIP messaging to my VOIP Server

ip nat inside source 192.168.1.100 10.10.10.2

---------Static NAT for RTP to my Media Server

ip access-list standard NAT_Addys

permint 192.168.1.0 0.0.0.255

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