My pleasure; glad it helped.
To select which SPx is used by default for outbound calls, log into your OBiTALK portal page, click the gear icon to get to settings, click the SP2 selection, then check-mark the box next to "primary line for outgoing calls". If you want to use the other line for outbound calls, then dial its SP number before dialing the phone number, like this:
Use SP1: **1 14255551212
Use SP2 (if it isn't already the selected default): **2 14255551212