asterisk users - Jun 2010 - Unable to set callerid for incoming skype calls

HI,

I'm using the usual Set(Callerid(num) function to change the incoming 
from skype callerid but it's not working.

Asterisk 1.4.31 and last release of skype channels


This is the dialplan

exten => _0X.,1,NoOP(${CALLERID(num)} - ${CALLERID(name)})
exten => _0X.,n,Set(STRINGA="Skype")
exten => _0X.,n,NoOP(${STRINGA})
exten => _0X.,n,Set(CALLERID(num) = ${STRINGA})
exten => _0X.,n,NoOP(${CALLERID(num)} - ${CALLERID(name)})

and is the output
NoOp("Skype/lab.trentinonetwork.it-08a32278", "mapiazza - Matteo 
Piazza") in new stack
     -- Executing [0461020224 at dial-to-openser:2] 
Set("Skype/lab.trentinonetwork.it-08a32278",
"STRINGA="Skype"") in new stack
     -- Executing [0461020224 at dial-to-openser:3] 
NoOp("Skype/lab.trentinonetwork.it-08a32278", "Skype") in
new stack
     -- Executing [0461020224 at dial-to-openser:4] 
Set("Skype/lab.trentinonetwork.it-08a32278", "CALLERID(num) =
Skype") in
new stack
     -- Executing [0461020224 at dial-to-openser:5] 
NoOp("Skype/lab.trentinonetwork.it-08a32278", "mapiazza - Matteo 
Piazza") in new stack

As you can see the incoming callerid(num) "mapiazza" doesn't
change.

Is there any limitation on skype channel ?

Matteo


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