Zephyr Xstream is a full-featured ISDN transceiver with high-fidelity MPEG-2 AAC and low delay MPEG4 AAC-LD coding, along with standard Layer 3, Layer 2 and G.722. It includes AES/EBU I/O and features full duplex stereo operation of up to 20kHz audio on a single ISDN line; broadcast quality mono audio at 15kHz or 20kHz is possible on a single ISDN “B” channel or other 56/64 kbps channel. Includes built-in ISDN Terminal Adapter for worldwide use. There’s also an Ethernet port for remote control and IP audio streaming.