Back in November of 2013, I reported that Google Voice (GV) would no longer allow third party connections to the GV network via the open source XMPP protocol portals.
At that time, Google said that they will be disabling their support for the open source XMPP protocol via 3rd party apps, which allows external access to Google's messaging and voice services.
Obihai's popularity in large part was due to their ability to enable the Obihai VoIP ATA's to connect directly into the Google Voice XMPP portal.
It was a big shock to everyone when Google announced that connections to their GV network was unauthorized by 3rd party services and should be discontinued by May 15, 2014. Obi customers were sent scrambling looking for other low-cost alternatives to the Google Voice VoIP phone calling services.