新词介绍：拨号点及拨号点搜寻:2012年计算机一三四级考试考试:三级考试-百考试题网

　　A dial peer, also known as an addressable call endpoint, is a device that can originate or receive a call in a telephone network. In voice over IP (VoIP), addressable call endpoints can be categorized as either voice-network dial peers or POTS (plain old telephone service) dial peers. Voice-network dial peers include VoIP-capable computers, routers, and gateways within a network. POTS dial peers include traditional phone sets, cell phones, and fax machines.

　　The term dial peer is sometimes used in reference to a program that matches a specific dialed sequence of digits to an addressable call endpoint. According to this definition, there is one dial peer for each call leg (connection between two addressable call endpoints).

　　Dial Peer Hunting

　　Dial peer hunting is a feature of voice over IP (VoIP) systems in which the device at the originating router attempts to find an alternative addressable call endpoint if it cannot establish a connection to the intended endpoint. For dial peer hunting to work, the originating router must be configured with a list (sequence) of dial peers, all of which can route a call to the same endpoint, but using different destination routers. If the originating router receives an invalid-number or user-busy code from the destination router, the originating router proceeds to the next dial peer in the sequence.

　　拨号点也称可寻址的呼叫端点，是电话网络中产生或接收电话的设备。在IP电话（VoIP）中，可寻址呼叫端点可以分为两类: 语音网络或普通老式电话服务（POTS）的拨号点。语音网络拨号点包括具有VoIP功能的计算机、网络中的路由器和网关。POTS拨号点包括传统的电话机、手机和传真机。

　　拨号点这个术语有时也是指一个程序，其特定的拨号数字序列与一个可寻址呼叫端点相匹配。按此定义，每次呼叫连接（两个可寻址呼叫端点之间的连接）都有一个拨号点。

　　拨号点搜寻

　　拨号点搜寻是IP电话（VoIP）系统的一个特色，其中起始路由器处的设备在与想找的端点之间不能建立连接时，试图寻找一个可替代的可寻址呼叫端点。为使拨号点搜寻开始工作，起始路由器必须配备拨号点的列表（序列），能利用不同的目的地路由器将一个呼叫路由到同一端点。如果起始路由器接收到空号或目的地路由器的用户忙于编码，起始路由器就开始序列表中的下一个拨号点。