asterisk users - Oct 2012 - how does GOTO_ON_BLINDXFR work?

10.9.0. I'm trying to have a setup where hitting # sends the called 
party to the confbridge. I've set  GOTO_ON_BLINDXFR:

CLI> dialplan show globals
.........
GOTO_ON_BLINDXFR=tel-incoming^confbridge^1

(Also tried tel-incoming,confbridge,1 and using | )

but it doesn't work:

Dial("DAHDI/1-1", "DAHDI/4/xxxyyyzzzz,,tT") in new stack
     -- Called DAHDI/4/xxxyyyzzzz
     ...........
     -- DAHDI/4-1 answered DAHDI/1-1
     -- Started music on hold, class 'default', on DAHDI/4-1
     -- <DAHDI/1-1> Playing 'pbx-transfer.ulaw' (language
'en')
[Oct  9 18:10:33] WARNING[28164]: features.c:2367 builtin_blindtransfer: 
No digits dialed.
     -- <DAHDI/1-1> Playing 'pbx-invalid.ulaw' (language
'en')

sean