Commander G3 Field - Remote broadcast codec with optional 3G module (Refer to Codec Accessories). Stereo FM-Quality remotes via IP, Mono via POTS. (POTS compatible with Comrex Matrix, Vector, Bluebox & Access IP and Compatible via SIP EBU 3326 and ISDN compatible with most brands) Add optional Wireless, POTS, ISDN or X.21 modules - Requires two Tieline Units