actually I had a typo in my setup but you got the idea that my LINE is connected to the Vonage
adaptor. My setup is:
PHONE -> Obi110 -> Vonage adaptor -> Dlink DIR-655 router -> Motorola Surfboard modem (comcast)
In your case it sounds that you use two separate sets of phones: one set connected to the vonage
PHONE port and one connected to your Obi.
BTW, the statement that Obi doesn't support SIP seems wrong. Obi does support SIP as well
as the XMPP protocol (and whetever else) that allows it to work with Google voice. In fact
and with the above setup I mentioned, I have SIP, Google as well as the Vonage adaptor going through
the Obi. And naturally the Obi is a SIP endpoing in addition to Vonage.
L.