asterisk users - Oct 2010 - SIP NOTIFY to make linksys/cisco SPA BLF go yellow

Hi,
I was wondering if anyone stumbled upon the correct event in a sip
NOTIFY (from a SUBSCRIBE)
to make the BLF lamps on a Linksys/Cisco SPA9xx/5xx go yellow?
I'm trying to differentiate between "On the Phone" and
"DND" with the BLF.

Thanks.

-- James