${BLINDTRANSFER} contains the active SIP channel that blind transfered the call.

This is usefull if you are trying to determine who to bill, or if you are trying to figure out a call back number for the transfered call. You could do something like this:

example (not tested, use at your own risk):

exten => s,1,Noop(BLINDTR = ${BLINDTRANSFER})
exten => s,2,GotoIf($[${LEN(${BLINDTRANSFER})} > 0]?10) ;if there is anything in the blindtransfer then you want to do something
exten => s,3,Dial(SIP/${ARG1},45,tr)
exten => s,10,Noop(we have been blint xfered by: ${BLINDTRANSFER})

See Bug 3268
Created by: shmaltz, Last modification: Mon 23 of Jun, 2008 (19:01 UTC) by mwilliams
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