asterisk users - Sep 2012 - Extension hints, which info available?

Hello,
I want to manage hints in a different way, putting all the hints in the
same context and trying to recognize the subscribing peer, but I can't find
any variable set about the calling peer. Peers need to be authenticated to
be able to subscribe to the hint, but I am not able to access any of the
info usually available when a registered peer place a call, like
${CDR(accountcode)} or ${CHANNEL(peername)} ... the only variable I can use
is ${EXTEN}

Leandro
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