destination-pattern and incoming called-number

I am very confused about the difference between destination-pattern and incoming called-number like in the example before
I read the Cisco Doc that said that incoming called-number to match the incoming call leg to an inbound dial peer
and destination-patternto match the Called number (DNIS) strings for outbound

dial-peer voice 1 voip
destination-pattern 4...
session target rasincoming called-number 4...

I hope if anyone help me to understand the difference in that example

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Received on Tue Nov 06 2012 - 01:37:51 ART