Yes, get a free NY State DID. It doesn't matter where that number is located (as long as it is in the continental USA).
Sign up for the number. Set up a SIP username and password for that number. Consider also paying the small monthly fee to get emergency 911 calling from Callcentric.
Log onto the OBiTALK web portal, click on your OBi device, and click on an unused Service Provider (SPx). Then, on the next page, scroll down to the bottom of the page and click the "OBiTALK Compatible Service Providers" link. On the next page, select Callcentric, and then enter your Callcentric DID's SIP username (it will be 1777xxxxxxx) and SIP password. Complete the procedure and confirm that you can call the number and it rings on your attached telephone.
After this works, sign onto your Google Voice account, add and verify the CC DID number, put a check mark to the left of it, and remove the check mark next to Google Chat.
Now, outbound calls will go out over Google Chat, and inbound calls will route through your CC number. You will also enjoy getting Caller ID Name (CNAM) on your inbound calls. Make sure you configure your OBi to use the Google SPx as the default for outbound calls, and configure the CC SPx to ring on inbound calls, and to use the CC number for 911 calling.