Bruce,
GV and most voip providers like to see eleven digits starting with "1", so by default the OBi prepends the "1" if only ten digits are dialled. Here is the default digitmap for sp3:
Service Providers > ITSP Profile C > General > DigitMap:
(1xxxxxxxxxx|<1>[2-9]xxxxxxxxx|011xx.|xx.|(Mipd)|[^*#]@@.)
To fix your problem change it to this:
Service Providers > ITSP Profile C > General > DigitMap:
(1xxxxxxxxxx|[2-9]xxxxxxxxx|011xx.|xx.|(Mipd)|[^*#]@@.)
Additional to the above, automatic routing of calls starting "613" to sp3 can be done by changing whichever digitmap is your Primary Line. For example if the Primary Line is sp1, then something like this:
Service Providers > ITSP Profile A > General > DigitMap:
(<**3>613xxxxxxx|1xxxxxxxxxx|<1>[2-9]xxxxxxxxx|011xx.|xx.|(Mipd)|[^*#]@@.)