基于软核CPU技术的IP电话接口设计

Study and Design of IP Phone Interface Based on Soft Core CPU Technology

提出了一种基于会话初始化协议的VoIP系统(包括IP电话终端、SIP服务器和PSTN接入端口),并对SIP与PSTN的互联进行了系统级构建。利用Altera的SOPC软核CPU技术和Nios II处理器构建了一个IP电话终端。该设计具有灵活的可扩展性,能够在实现语音通信的基础上较容易地扩展视频接口、短信平台等多媒体功能,给产品用户和运营商提供了一种低成本的多媒体网络通信终端设备,具有广阔的市场前景。

This paper brings forward a VoIP system based on Session Initial Protocol （SIP）,including IP phone terminal,SIP server and PSTN interface.Meanwhile,it builds an interconnection structure between SIP and PSTN.It makes use of Altera SOPC soft core CPU technology and Nios Ⅱ processor to build a IP phone terminal.It＇s able to expand flexibly and upgrade,such as easily expand a VGA interface and short message platform.That is a low-cost multi-media communication terminal for production user and server support.So it has a broad market foreground.