The Google Voice support that was introduced a year ago uses a different method of accessing your account(s). Now, rather than directly entering your Google user ID and password into the device, you separately sign into your own Google account(s), and grant OBiTALK access to the Google Chat service. During the setup procedure, you simply need to be first signed into the correct Google account you want to use for each SPx slot. It will pop up a window, showing your Gmail address, and ask you to confirm it's the correct account to grant access.
If you set up your device under the old method (that asked you for your Google password), then you simply need to reset your OBi and start fresh. First, log into your Google account that you want to use for SP1, and follow the steps to add it to your OBi SP1 slot, then (optionally) log out of that Google account, and log into the other Google account, and repeat the steps for SP2. It is actually easier than it sounds here...just carefully read the prompts on your screen and respond.
Oh, and spark up a bowl
after you finish setting it up, not before.