[Serusers] set_sattr?

[Chris St Denis]

Like this mailing list entry from Dec 2004, I need to have the INVITE timer
wait longer when calling some numbers than others.
http://lists.iptel.org/pipermail/serusers/2004-December/013701.html

The response says to use set_sattr("callee_fr_inv_timer", "123");

I've upgraded to ser .9.0 (unstable?) but it still doesn't seem to exist in
that version. What version do I need for this function? Will it be available
in .9.2 stable when it is released?