The Barix MA400 SIP Opus Codec is a bi-directional mono audio codec with SIP link negotiation for audio distribution and contribution in SIP-based environments. It provides a software-selectable microphone or line input, a transformer-isolated balanced mono line output, and a speaker output delivering up to 5 W into 8 ohms. The unit supports Opus, G.711, G.722, GSM, and iLBC codecs, 10/100 Mbps Ethernet, and IEEE 802.3af PoE.