SLA attemptcallerid

sla.conf says:

Does anyone have a description of what SLA callerID handling should do?

Does anyone have a list of the situations where SLA callerID handling does not work properly?

The description implies to me that one might as well ignore “attemptcallerid” for any production system. Surely a definition of what it should do together with a known problem list would be better than nothing?