[Asterisk-Users] soxmix?

[Altus Syman]

Good day all
I cant get asterisk to join 2 recorded files with Monitor() and sox
I have a asterisk version 0.9.1 and a zaptel card
I installed sox 12.17.6 and copyed soxmix to /bin
I added these in my extensions.conf

exten => _0.,1,SetVar(CALLFILENAME=${EXTEN:1}-${TIMESTAMP})
exten => _0.,2,Monitor(wav,${CALLFILENAME},m)
exten => _0.,3,Dial(Zap/g2/${EXTEN:1})
exten => _0.,4,Congestion

Thanks Seth

but after a call ther in extension-time|m-in.wav and 
extension-time|m-out.wav

Please help
Altus