Embedded IP Phone based on EISC architecture with SIP Protocol

摘要

PURPOSE: An embedded IP phone installing an EISC(Extendable Instruction Set Computer)-based SIP(Session Initiation Protocol) protocol is provided to improve the speed and performance of the embedded IP phone by mounting an EISC-based MCU(Micro Controller Unit) and installing the SIP communication protocol. CONSTITUTION: If a system is initialized, all execution codes stored in a flash RAM are copied to a DRAM and the entire procedure is executed through the DRAM. An Ethernet module performs communication among several terminals in an IP Ethernet. The Ethernet module uses an EISC-based MCU embedding an Ethernet controller. A physical layer chip is connected between the Ethernet controller of the MCU and an RJ45 for transmitting an Ethernet packet to a network through the RJ45. The EISC-based MCU performs a bidirectional communication between IP terminals through an SIP communication protocol installed in the system, and transmits a network packet including voice digital data generated in a DSP(Digital Signal Processor) through the Ethernet module to be capable of voice communication.