新詞介紹：撥號點及撥號點搜尋

Dial Peer
　　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.

　　撥號點

　　撥號點也稱可尋址的呼叫耑點，是電話網絡中産生或接收電話的設備。在IP電話（VoIP）中，可尋址呼叫耑點可以分爲兩類: 語音網絡或普通老式電話服務（POTS）的撥號點。語音網絡撥號點包括具有VoIP功能的計算機、網絡中的路由器和網關。POTS撥號點包括傳統的電話機、手機和傳真機。

　　撥號點這個術語有時也是指一個程序，其特定的撥號數字序列與一個可尋址呼叫耑點相匹配。按此定義，每次呼叫連接（兩個可尋址呼叫耑點之間的連接）都有一個撥號點。

　　撥號點搜尋

　　撥號點搜尋是IP電話（VoIP）系統的一個特色，其中起始路由器処的設備在與想找的耑點之間不能建立連接時，試圖尋找一個可替代的可尋址呼叫耑點。爲使撥號點搜尋開始工作，起始路由器必須配備撥號點的列表（序列），能利用不同的目的地路由器將一個呼叫路由到同一耑點。如果起始路由器接收到空號或目的地路由器的用戶忙於編碼，起始路由器就開始序列表中的下一個撥號點。