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On the left menu, click **PBX--> Extensions**, and enter the page below {{:en:module_manual:pbx:extension_page.jpg?768|Extension Page}} 此页面内的数据 分别来源于 The data in the page come from 【Device】 【Queue】 【Ring group】 【IVR】 【Conference】 【short key】 【Hotkeys】 【System application】 In this page you can set extension number for the modules above. Click【Add】 to open the adding page, {{:en:module_manual:pbx:extension_add.jpg|Add Extension}} **Extension：** add extension number for inside calls. **Team：** which team this extension nubmer belongs to. **Target：** the target module. **Target ID：** the corresponding data. Then Click [Save], and you can see the newly added information shown in this page. {{:en:module_manual:pbx:extension_list.jpg?768|Extension Data}} **【Number Duplication】**Related to both extension number and team. If one shares the same of the both, the system will note you the number duplication. **【Data Delete】**In the extension page, you can delete the number added to the module here, and for those data that were not added in this page, it will jump to the corrsponding module, and you can delete the data in that page. Double click the item to enter the edit page. {{:en:module_manual:pbx:extension_edit.jpg|Edit Extension}} In the sub-edit page, data in grey means unchangeble, and only extension numbers can be changed. And if duplicated number appears, the system will note you.