asterisk users - Oct 2011 - Voicemail in asterisk 1.8.7, stop working

Hi All;

I was having asterisk 1.8.5 and I installed 1.8.7, I copied the extensions.conf,
sip.conf, voicemail.conf that I was using them in 1.8.5 to the new asterisk
1.8.7.

Every thing fine, but now the voicemail is not working at all !! Even does not
display on the consol any thing that it declares to run the Voicemail function,
instead of running the voicemail, it rings some rings and then run to the next
step !! I am using the below configurations:

[macro-voicemail]

exten => s,1,Dial(${ARG1},20)
exten => s-NOANSWER,1,Voicemail(${MACRO_EXTEN}@Internal,u)
exten => s-NOANSWER,2,Goto(IncomingPSTN,t,3)      
exten => s-BUSY,1,Voicemail(${MACRO_EXTEN}@Internal,b)
exten => s-BUSY,2,Goto(IncomingPSTN,t,3)
exten => _s-.,1,Goto(s-NOANSWER,1)              
exten => a,1,VoicemailMain(${MACRO_EXTEN})

What is the difference in using asterisk 1.8.5 and 1.8.7 in voicemail part? How
I can troubleshoot?!

Regards
Bilal