21CN WBC - SRA?

[#1]

Cor. What an acronym-ridden topic title.
So - my exchange is 21CN enabled, and I've got a router (Billion BiPac 7402nx which is SRA-capable) which can facilitate this. Is this something I should enable? What benefit will I get from this?
Still getting my teeth into ADSL.. apologies for the stream of semi-n00b posts!
Cheers folks.

[#2]

At the moment 21CN does not support SRA, BT have turned it off for some reason only they understand.
There is a rumour they are may change this and are going to trial SRA at some time in the future. Maybe Mr. T will be along and update us on this subject.