摘要
IP网络电话(Voice over Internet Protocol,VoIP)作为一种全新的网络服务,在NGN(下一代网络)网络融合的大趋势下,呈现出了广阔的应用前景。VoIP领域有两种协议,分别为ITU-T的H.323和IETF的SIP。目前,常见的IP电话主要是软终端为主,即使有少许硬终端,也大都基于H.323,且功能复杂,开发成本高。论文采用专用于VoIP的USB音频控制器CM109,将通话功能集成在电话终端和PC上,用USB接口把IP电话作为PC的一个USB设备,通过开源协议栈oSIP实现了终端设备的通话功能。
In the network convergence trend of NGN（Next Generation Network）, VolP（Voice over Internet Protocol） has showed a broad application prospect in this background as a new network service. There are two major signaling proto- cols in VoIP field, including ITU-T recommends H. 323 and IETF（Internet Engineering Task Force） delivers SIP（Session Initiation Protocol）. Although there are a little hard terminals which are all based on H. 323 with complexfunctions and high development costs, common IP Phones are mainly soft terminals presently. Audio processing chip CM109 which is a USB an- dio controller specifically for VoIP applications is adopted in this thesis. Call function is integrated on PC, the IP Phone ter- minal is seen as a PC device through USB interface, and SIP call is realized by open-source oSIP protocol stack.
出处
《计算机与数字工程》
2015年第4期738-741,共4页
Computer & Digital Engineering
