[Serusers] radius check_from/check_to howto?

[Bruce Bauman]

In the SER issue tracker, someone raised the question of implementing
check_from & check_to for radius
(http://tracker.iptel.org/browse/SER-35).

The issue was closed saying that selects could be used to achieve this.
Does anyone want to clue me in as to how you would do this?

I can't for the life of me figure this out from the documentation.

Thanks.

-- Bruce