Feature Highlights OTX board One Texas Instruments TMS320DM6443 dual core processor with 4752 DSP MIPS and 297 MHz ARM9 processing power 256 MB DDR2 memory 128 MB NAND shared flash memory Zero, Two, Four or Eight T1/E1 interfaces Fully compatible with Asterisk® Open Source PBX software MontaVista Linux on ARM core Support for ISDN PRI and SS7 digital communication protocols. Built-in Web interface (FreePBX GUI) for simple configuration and status verification SNMP traps and monitoring (reporting of problems in remote systems) Native Bridging Mode Supports full E1/T1 channel capacity utilization for Native Bridging or SIP calls SD-card slot and USB port for expandability and persistent storage Supports hundreds of simultaneous voice codec transcoding (by offloading the transcoding operation to the powerful DSP core) operation to the powerful DSP core) Hardware Line / Network Echo Cancellation (EC) Green fan-less system, built-in temperature sensor, hardware watchdog, Real-time Clock