The MA400 SIP Opus codec enables remote contribution links with SIP and the high-quality, open audio format Opus in a cost-effective solution. The advantages of the royality-free Opus codec are its quality, efficiency and low latency. Combined with the SIP functionality to establish seamless links across VoIP and other IP based communications systems, it is ideal for remote contribution applications. The SIP functionality in the Barix unit allows to dial another device or auto replies to a call and automatically negotiate a transmission link. The unit provides microphone or line input and line and speaker output on both sides. Two units can work togheter or one can interoperate with 3rd party products such as Wheatstone, Comrex or other SIP Opus enabled equipment.