PortForwarding and PAT for same internal machine

Hi,

i have problem in publishing my internal server for both NAT and PAT.

Details:
1) I can able to publish my VoIP server (192.168.10.10) on port 5060 using public ip (10.10.12.12) address on my cisco asa 5510 router. so , all incoming traffic with with destination 10.10.12.12:5060 will directly hit my internal voip server on 192.168.12.10:5060 port.

2) now i have requirement to add PAT to above setup. but, both PortForwarding and PAT should work for me.

ex: internetuser:10000---PAT---192.168.12.10:5060

can any one help me in resolving above.

Thanks