[asterisk-users] Grabbing authenticated mailbox value from VoicemailMain()

[sip]

Is there a way for me to grab the value of the authenticated mailbox from the
VoicemailMain() app? 

If a user calls in to the main extension, enters in a mailbox and password and
authenticates, I want to know what mailbox number was authenticated for use in
another app. For instance, when the AdvancedVoicemail stuff is being used, and
a user is dialing out from within voicemail (option 4 to place an outgoing
call), I currently have that dialout going to a particular context and within
that context, I'd like to be able to set the new callerID to be the callerID
of the authenticated user (not the original caller). 


Any ideas?