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This device recomended itself as very flexible and configurable thing. I configured this device for one small office with 5-6 employees. As a result this device replaced hardware server with asterisk inside. Important notice Device should have firmware version >= 6.1.12(XU). Otherwise you won’t see this options At first we need to login to web-ui of device with administrator privileges. Clicking on button Advanced. Then we need to go to Voice tab and find channel T1....