Hi . I just actived cloud server for test , no technical support yet, confused with some feature, looking for help ,will be really appreciate! 1. Is the 3CX cloud server a good option for manage multi business customers ? considering network risk to build my own server, I prefer to try 3CX cloud server, I want to serve more small business customers who will have 5-20 remote extensions ( want to use cisco SPA303/504G..), but I didn't see any settings can group some extensions to different sub-companies,most time company's extensions start from 101..., the cloud seems can't accept same extension number, so will the 3cx cloud server be good option for me to serve more business customers? is any addon feature for billing customers? . 2. I tried to provision remote cisco 504g (firmware7.6.1), no lucky. The extension provision method option only show local lan (in office), no option of SBC, do some search , from : https://www.3cx.com/community/threa...with-3cx-15-5-cloud-hosted.49640/#post-201542 Limitations Known limitations of Cisco SPA 302, 303, 501G, 502G, 504G, 508G, 509G, 512G, 514G, 525G, 525G2 are: No PnP Support No STUN Support No SBC Support No Full CTI Support (Make Call Only) BLF Functionality (only on applicable models) Company Phone Book with limited size only Manual DST Support Is this means cloud will not support provision these cisco ip phones remotely ? cisco SPA5XX is so popular ,if not supported ,what is the cloud feature use for ? Have to install 3cx to my own server in order to use remote extensions ? Also uncheck "Disallow use of extension outside the LAN" , and tried add my public/local ip to block ip list: allow 192.168.0.0/16; allow 172.16.0.0/12; allow 10.0.0.0/8; allow 127.0.0.1; not working from my browser: https://<3cxremoteip>/provisioning/<folder>/<mac>.xml can be reach and see the detail settings, but http://<3cxremoteip>/provisioning/<folder>/<mac>.xml is not reachable. Thanks a lot if someone can make it clear. BTW , this kind of general question will not be answered by 3CX offically ? How customers can make decision before buy if nobody response ?