Obihai Technology OBi300 VoIP Telephone Adapter The OBi300 is a SIP service provider only product. Note: The OBi300 does not support the Google Voice communications service. SIP Service Provider Support for Up to Four (4) SIP Accounts Aggregation / Bridging of Four (4) SIP Voice Services and One (1) OBiTALK Service Multi-Service Redundancy Through Use of Trunk Groups Per Service Multi-Proxy Redundancy