SIP Trunk

For marketing reasons, many providers associate a SIP Trunk with a single phone call.

对于市场的原因，许多供应商带来一个单一的电话呼叫的SIP中继。

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The provider can also terminate PSTN numbers, and route incoming calls for those numbers back to the IP PBX over the SIP can also Trunk.

当一个呼叫从内部到外部电话放在号码，交换机发送必要的信息提供者的SIP中继谁建立了调用拨打的号码，并作为为调用中介行为。

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When you purchase such a SIP Trunk, it provides the ability to place one call at a time through the service provider's network.

当你购买这样一个SIP中继，它提供了能够在一个地方通过一次电话服务供应商的网络。

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The SIP Trunk provides a virtual SIP relay which is similar to the traditional PSTN relay to enable the direct interconnection between the internal IP-PBX of enterprises and the external INTERNET IP phone operators.

SIP Trunk提供了一种类似于传统PSTN中继的虚拟SIP中继来使企业IP-PBX与外部的INTERNET电话运营商之间通过IP进行直接互连。

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This technology is called SIP TRUNK. Firstly, this article gives the basic concept of SIP and SDP, introduces their application background and analyses their basic principles which provide sufficient theoretical basis and practical foundation for the realization of SIP Trunk gateway.

本文从SIP协议、SDP协议的基本概念入手，介绍了它们的应用背景，分析了基于SIP协议和SDP协议建立会话的基本原理，为SIP Trunk网关的实现提供了充足的理论依据和现实基础。

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It is certified that SIP Trunk can not only compatible with the original SIP voice function, but also can save the cost of enterprise management, and promote the building of IP based enterprise communication network.

充分证明了SIP Trunk不仅能够与原有SIP语音功能兼容，更能够节约企业管理成本、促进企业全网IP化的建设。

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Because a SIP Trunk is not a physical connection, there is no explicit limit on the number of calls that can be carried over a single trunk.

因为一个SIP中继不是物理连接，也没有就可以在一个单一的电话号码进行明确的主干限制。

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In this network architecture, all external calls are routed through the SIP trunk to the ITSP.

在这种网络架构中，企业所有的外部呼叫均通过该SIP中继路由到ITSP来完成。

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