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Please visit the following link:
http://books.google.com.pk/books?id=vtQxJ3oSm64C&pg=PA298&lpg=PA298&dq=how+to+Customize+System+Prompts+in+Asterisk%3F&source=web&ots=LVWeK0Mm88&sig=cJXx_AOWUaxt0yl3Bjagb41NV1s&hl=en&sa=X&oi=book_result&resnum=3&ct=result
Posted by sagitraz
In keeping with the seemingly limitless flexibility of Asterisk, you can also modify the system prompts. This is very simple to explain, but generally difficult to do well.
With more than 300 system prompts in the main distribution, and an additional 600 in the asterisk-sounds add-on, if you're contemplating customizing all of them you'd better have either a lot of money or a lot of time on your hands.
Posted by james_winston