Here is even an easier test:

Make sure your VOIPO is set back to DHCP on the WAN side.
Power off your cable/dsl modem.
REMOVE your WRT.

Plug the cable that went into your WRT into the VOIPO WAN port. DON'T ATTACH ANYTHING ELSE.

All you have now is CABLE MODEM into VOIPO WAN port. No computers, no phones.

Power up CABLE MODEM
Power up VOIPO

Does your phone work?

If not, bad Voipo
If so misconfigured WRT router

(This is all assuming you didn't mess up the WAN settings on the Voipo device).