Ahmed,
You dont need to use SIP for the fxs port. You can just use SCCP to register them to CUCM
Use the doc below as a guide..
What you need to register fxs to cucm is the MAC address..which will be the mac address of the interface you are using for SCCP but you will remove the first 2 leading zeros. So if the MAC address of the interface is
00DA2FE2B000
THE MAC YOU WILL USE IN CUCM IS DA2FE2B000
https://supportforums.cisco.com/docs/DOC-9443
http://www.cisco.com/en/US/docs/ios/12_4t/12_4t2/ht1vg224.html
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