无线呼叫服务系统为点对多点通信，存在信道冲突问题。

The wireless calling service system is a kind of one point to multipoint communication, which has the problem of channel collision.

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该合同要求该系统集成商提供服务器，存储器，网络，无线，统一通信和呼叫中心援助等服务。

The contract calls for the systems integrator to provide servers, storage, networking, wireless, unified communications, and call center assistance.

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无线通信系统采用移动通信提供的短消息服务和网上无线呼叫服务。

Wireless communication adopts the short message service of GSM and network wireless call service.

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