changing both source and destination with nat

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How can I change both the source and destination addresses of incoming packets?

Assuming the following configuration:

interface FastEthernet0/0 description Internet ip address x.x.x.1 255.255.255.0 ip nat outside ! interface FastEthernet0/1 description Internal Network ip address 172.1.1.1 255.255.255.248 ip nat inside ! ip route 172.2.1.0 255.255.255.0 172.1.1.2

Incoming packets to x.x.x.2 need to have the destination changed to

I can change the destination address using: ip nat inside source static 172.2.1.2 x.x.x.2 but how do I also change the source address?

Any suggestions would be appreciated. Thanks, Christian