EWSD交换机如何实现对非法呼叫的限制

Restriction of Illegal Calls by EWSD Exchange

针对网上大量的无效话单，我们可以通过对直拨用户交换机（ＤＩＤ）发起的呼叫进行主叫号码鉴别，对携带的主叫号码是非法号码或无效号码的呼叫予以拒绝，以保护企业利益。

There are always large numbers of in- valid call tickets in the network. In order to safe- guard the interest of the carriers, we can reject calls from illegal or invalid calling numbers by discrimi- nating the calling numbers of calls exchanged by DID (Direct Inward Dialing) exchanges.