SAF and PSTN fail-over question

If you have SAF configured between CUCM and CME and in the CME dn-block you have the following

 

profile dn-block 1 alias-prefic 1989555

    pattern 1 type extension 35XX

 

on loss of the SAF neighbor the CUCM phones should fail over to calling over the PSTN (assuimng proper globalization and a route exists to +198955535XX).

But what I have not been able to determine is what CSS gets used in this situation. I think it is the AAR CSS of the device calling 35XX either that or it does not really use a CSS as the user was already alowed to call 35XX.

Anyone have any idea?

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