Assuming SP1/ITSPA = Google Voice and SP2/ITSPB = VoIP Raider and PrimaryLine = SP1 Service, 311 and 411 through Google Voice could be implemted by adding two rules to the ITSPA DigitMap:
(<311:1aaa1234567>|<411:1aaa1234567>|1xxxxxxxxxx|<1>[2-9]xxxxxxxxx|011xx.|xx.|(Mipd)|[^*]@@.)
where 1aaa1234567 is the number you wish to be called when you dial 311 or 411.
411 options would include:
18005551212
18003733411