Linksys SPA942 Bridged Line Appearance

I know the Linksys SPA942's support Bridged Line Appearance (BLA/SLA) with the latest firmware upgrade. Does anyone have experience with how to implement this? Currently the Wiki for Sipx only talks about polycom phones.

And yes, I do understand how a PBX is supposed to function but sometimes emulating that key system functionality is what works best (especially in the 2 user, 2 POTS situation I am looking at now). It seems like any time anyone mentions SLA/BLA in forums people start with the "we should just teach people how to use their phones".