[asterisk-users] SetVar Warning

[Gary Kuznitz]

I had lines 3 and 4 and added line 1 and 2 to extensions.conf

exten => 106,1,SetVar(CALLFILENAME=${TIMESTAMP}_${CALLERID(num)})
exten => 106,2,Monitor(wav,${CALLFILENAME},m)
exten => 106,3,hint,SIP/106
exten => 106,4,Macro(stdexten,106,${HINT})   

I received this warning:
 WARNING[31463]: pbx.c:1832 pbx_extension_helper: No application 'SetVar' for 
extension (voicemenu-custom-4, 106, 1)

I'm running Asterisk/1.4.22.

Does anyone have any idea what I need to do to either make SetVar work or replace it 
with something else?

Thanks you,

Gary