I've found on wiki that there is a variable called ${BLINDTRANSFER} which should contain the channel (or a number) of user that made a blind transfer of a call to another extension. Also I've found a patch for chan_sip to add support for ${BLINDTRANSFER}, but it's not working at all (chan_sip crashing), so I guess it is intended for CVS-HEAD version. Has anyone tried to backport it to STABLE (1.0.7 preferably :) ). Thanks, Ivan