Amazon has OBi100 VoIP Telephone Adapter and Voice Service Bridge for $29.99.
The OBi100 has one phone port. It supports Google Voice, SIP & OBiTALK VoIP services. Use the OBi100 when you do not need an analog line to a traditional telephone network or service. The OBi100 is perfect for customers who do not have a traditional telco phone service and want the savings and simplicity of using a VoIP service for all their calls. [ Shop Now ]