VOIP(Voice over IP)技术可以将传统电信语音信号在IP网上传输,通过互联网连接不同地理位置的网关,实现传统语音通话网络与IP网络的资源共享。为了实现传统语音通信网络与IP网的互联,各网关之间需要使用SIP协议完成传统语音通信中需要...VOIP(Voice over IP)技术可以将传统电信语音信号在IP网上传输,通过互联网连接不同地理位置的网关,实现传统语音通话网络与IP网络的资源共享。为了实现传统语音通信网络与IP网的互联,各网关之间需要使用SIP协议完成传统语音通信中需要的信令传递。针对VOIP技术中对SIP协议应用的需求,文中研究了SIP协议的框架和编程实现方案。通过搭建基于SIP协议的VOIP通信系统,并重点实现使用SIP协议进行用户代理的建立和断开功能,从而介绍了在VOIP通信系统中SIP协议的基本原理和实现方法。文中介绍了一个基于ARM嵌入式系统的SIP语音网关信令处理部分的设计与实现。本系统运行在linux2.6版本的嵌入式操作系统中。在S3C2440核心处理器的开发板中,编译并移植整个SIP协议库。编写SIP协议应用软件,完成传统语音通信网络在IP网络传输中所需要的控制过程。经过测试,本文所设计的SIP用户代理(SIP UA)实现了建立会话、维护会话和终止会话等信令控制功能。展开更多
VoIP (Voice over IP) is a rapidly growing area with great market potential. To promote it for both commercial and research purposes, a prototype VoIP system based on state-of-the-art Motorola communication techniques ...VoIP (Voice over IP) is a rapidly growing area with great market potential. To promote it for both commercial and research purposes, a prototype VoIP system based on state-of-the-art Motorola communication techniques has been developed. It is a gateway system integrating a PBX and a VoIP module. All components that H.323 defines to support VoIP are implemented in the VoIP module, though in a simplified manner. As an embedded system, the system features real timeness and task distributiveness. A number of additional techniques are used to improve the performance, including noise suppression, zero copy, and buffer structure optimization. When refined in interoperability, the system will also readily serve as a product.展开更多
文摘VOIP(Voice over IP)技术可以将传统电信语音信号在IP网上传输,通过互联网连接不同地理位置的网关,实现传统语音通话网络与IP网络的资源共享。为了实现传统语音通信网络与IP网的互联,各网关之间需要使用SIP协议完成传统语音通信中需要的信令传递。针对VOIP技术中对SIP协议应用的需求,文中研究了SIP协议的框架和编程实现方案。通过搭建基于SIP协议的VOIP通信系统,并重点实现使用SIP协议进行用户代理的建立和断开功能,从而介绍了在VOIP通信系统中SIP协议的基本原理和实现方法。文中介绍了一个基于ARM嵌入式系统的SIP语音网关信令处理部分的设计与实现。本系统运行在linux2.6版本的嵌入式操作系统中。在S3C2440核心处理器的开发板中,编译并移植整个SIP协议库。编写SIP协议应用软件,完成传统语音通信网络在IP网络传输中所需要的控制过程。经过测试,本文所设计的SIP用户代理(SIP UA)实现了建立会话、维护会话和终止会话等信令控制功能。
文摘VoIP (Voice over IP) is a rapidly growing area with great market potential. To promote it for both commercial and research purposes, a prototype VoIP system based on state-of-the-art Motorola communication techniques has been developed. It is a gateway system integrating a PBX and a VoIP module. All components that H.323 defines to support VoIP are implemented in the VoIP module, though in a simplified manner. As an embedded system, the system features real timeness and task distributiveness. A number of additional techniques are used to improve the performance, including noise suppression, zero copy, and buffer structure optimization. When refined in interoperability, the system will also readily serve as a product.
