Yes you configure a css and pt to make use of fac and use that on the route patter tick the use fac box
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But can we configure Fac for SIP phone? i read some cisco document in which mentioned that SIP cannot support for FAC only SCCP can support.
Yes you right for CME but for CUCM some sip phones supports FAC , as far as 3905 is concerned it supports FAC .
I didnt find link for CUCM 9.x but that above link will help.
And also check this thread- https://supportforums.cisco.com/thread/2125452
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