The Polycom OBi200 1-Port VoIP Adapter is ideal for small businesses looking to upgrade their phone system. This adapter, made in China, is compatible with VoIP services like VoIPms, Anveo, and PhonePower. With features like 3-way calls, call forwarding, call waiting, faxing, and caller ID, this adapter can handle all your communication needs. The black adapter has multiple interfaces including USB, DSL/Phone (RJ-11), and Ethernet (RJ-45). It supports one phone line and is easy to set up. The unit quantity is one, making it perfect for small businesses looking for an affordable and reliable communication solution.