with the OBi202, you can assign incomings and outgoings to that phone port by using the "Primary Line for Outgoing Calls" and the "Incoming Calls Will Ring On" by checking the boxes associated with the phone ports. As in Phone 1 is for the 1st phone port and Phone 2 is for your 2nd phone port. Sign into your OBiTALK account, select the SP1 for your google voice account and there as mentioned.
Cancel out, select the Anveo E911 Sign-Up and assign to SP2, make sure to select only Phone 2 boxes and complete your registration with Anveo. (and if you are using google voice service as your Primary Outgoing calls, do not select Anveo as Primary Outgoing).
Also keep in mind that the 1st phone port is not the same as 2nd phone port. The 1st phone port (labeled Phone 1) has 4 active wire, with the inner pair wires are for LINE-1, and the outer pairs are for LINE-2. Good for 2-LINE phone handsets only (and not 3-LINE phone, nor 4-LINE, nor 5-LINE, etc)..