Obihai Technology was a company that manufactures analog telephone adapters that supported Session Initiation Protocol (SIP), XMPP, and Google Voice[2] compatible Internet telephony.
While most OBiHAI devices may still function temporarily, the eventual expiration of security certificates will end their integration with Google Voice.
[13] Obihai operated its own preconfigured OBiTALK VoIP service to allow direct calling between its branded devices (using **9 and a nine-digit serial number), as well as a companion OBiON softphone app for Android[14] and iPhone.
At the same time a community found a way to put a correct new Google certificates into Obi100/110 even without vendor support and anonymously described it in www.obifirmware.com.
The 2021 discontinuation of the Obahai 200-series analogue telephone adapters left no hardware devices from any source able to connect to the consumer Google Voice service.