官术网_书友最值得收藏!

Types of SIP servers

There are a few different types of SIP servers. Depending on the application, you can use one or all of them in your solution. OpenSIPS can behave as a proxy, redirect, B2BUA, or Registrar server.

The proxy server

In the SIP proxy mode, all SIP signaling goes through the SIP proxy. This behavior will help in processes such as billing and is, by far, the most common choice. The drawback is the overhead caused by the server in the middle of all the SIP communications during the session establishment. Regardless of the SIP server role, the RTP packets will go directly from one endpoint to another even if the server is working as a SIP proxy.

The redirect server

The SIP proxy can operate in the SIP redirect mode. In this mode, the SIP server is very scalable because it doesn't keep the state of the transactions. Just after the initial INVITE, it replies to the UAC with a 302 Moved Temporarily and is removed from the SIP dialog. In this mode, a SIP proxy, even with very few resources, can forward millions of calls per hour. It is normally used when you need high scalability but don't need to bill the calls.

The B2BUA server

The server can also work as a Back-to-Back User Agent (B2BUA). B2BUAs are normally applied to hide the topology of the network. They are also useful to support buggy clients unable to route SIP requests correctly based on record routing. Many PBX systems such as Asterisk, FreeSwitch, Yate, and others work as B2BUAs.

主站蜘蛛池模板: 宜丰县| 韶关市| 钟祥市| 三门峡市| 和林格尔县| 五河县| 阳江市| 乐清市| 界首市| 府谷县| 葫芦岛市| 阿巴嘎旗| 泾阳县| 永修县| 漳州市| 武清区| 大方县| 临城县| 邵阳市| 邢台市| 霍邱县| 贺州市| 同心县| 泗阳县| 邳州市| 永仁县| 灵寿县| 肥城市| 建平县| 会同县| 陆良县| 集安市| 桃源县| 沐川县| 芒康县| 易门县| 六枝特区| 鄂温| 屯门区| 千阳县| 伊吾县|