While traditional voice service is continually developing , supporting ip and high speed data service has already become an evolutive direction of 2g mobile communications system , which will become the main service characteristic of 3g mobile communications system 在继续发展语音业务的同时，对ip和高速数据业务的支持已经成为第二代移动通信系统演进的方向，而且也将成为第三代移动通信系统的主要业务特征。
On the whole , the future telecom network will gradually evulate to the following structure , i . e . to add the control layer on the internet network , to provide voice servie over ip using soft switching sip agent server . see the structure in exhibition 4 综合以上两种方式，今后电信网络将逐步向以下结构演进，即在internet结构中增加了控制层，利用软交换sip代理服务器提供基于ip的语音业务，其结构如图4所示。
Because of the development of technology and the enhancement of users ’ demand , the target which is optimized expands from one single carrier network to double - carrier or rather multi - carrier network , from the basic voice business network to the data - voice network 由于技术的发展和用户需求的提高,我们优化的对象从单载波网络发展到多载波网络,从提供基本的语音业务发展到提供多种业务的语音与数据结合的网络。
This paper advanced the testing scheme with voice service as a special example and how to realizing it with the software and hardware of the dsp system , what ' s more , the simulant testing experiment has been finished on the dsp system 另外，为了实现对所研制的ont进行整体功能的测试，本文以语音业务作为高层业务的一个特例，提出采用dsp系统对ont进行整体功能检测的软硬件实现方案，并对所设计的检测系统进行了模拟实验研究。
With the increasing of mobile phone users and high - speed asymmetrical data service , the second generation mobile communication system ( 2g ) which can only provide symmetrical speech service and low - speed data service ca n ' t meet demand 随着移动用户数量的迅猛增长，高速率非对称的ip型数据业务、多媒体业务的日益剧增，仅限于对称的语音业务和低速数据业务的第二代移动通信系统( gsm 、 is - 95cdma )频率资源越来越紧张，已不能满足需要。
On the other hand , the national business of the immobile telephones turn high - speed increase into slow development at present . the business of speech sounds are continuously subject to the extrusions of local mobilezations and long - distance ip calls . the value of consumers is always declining 另一方面,目前我国的固网电话业务由原来的高速增长期步入平缓发展期,语音业务不断受本地移动化、长途ip化的分流挤压,用户的arpu值在不断下滑。
The softswitch is the core technology of the next generation network , for it can be the core to offer calling , control and service for voice service , data service and video service in the next generation network , and it also plays the key role in the evolvement of scn to the psn 软交换是下一代网络的核心技术，因为它可以成为下一代分组网络中为语音业务、数据业务和视频业务提供呼叫、控制和业务的核心，同时也是电路交换网向分组网演进的关键。
Second , with the implemented measuring tool , actual measurements are conducted . by comparing the performance of voip in different mobile / wireless network scenarios , strategies to improve qos for voip in mobile / wireless networks are discussed , and diffserv is introduced to provide qos 然后，本文对无线移动网络中实时语音业务的传输性能参数进行实际的测试、分析和评估，考察使用diffserv为实时语音业务提供qos ，改善移动节点越区切换性能的方法。
