asterisk users - Jun 2008 - problems getting dialed information on asterisk

Hello
I have asterisk with a sip connection with an external provider, getting the
calls from a toll free number.
Asterisk collects information from the callers, using also an script on windows
with the dial plan.

Debuging the script, I noticed that randomly asterisk losses some of the
characters I typed on the phone.
?Is there anyway to avoid this problem? 

Thanks in advance for any advice
Greetings
Enediel
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