When a number of developers work on a single project it's important to make sure that the latest version of the code in the version-control system (the trunk) will always build.
当有许多开发人员在同一个项目上工作时，重要的就是要确保构版本控制系统中代码的最新版本一直被构建。
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If the number being called can be reached over a SIP Trunk, the call does not need to be routed over the PSTN, but can be carried on the IP network end to end.