fataldata

Change this entry in your Public Unknown Numbering table
4 6 1 03391789 10
to a CPN Len of 12 if you want the extensions to show up at the end of your CPN Prefix. Currently with it set to 10, i'm guessing is why you are seeing
0339178970 and not 033917896870.
As for the reason your callers see 033917896850.
Is there anything special about extension 6850? Like is it a Trunk Group extension or the billing number for the DS1 that Trunk group 1 uses?

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Systems In Use:
S8700 CM3.0 and S8710 CM3.1.1