Please forgive the basic topic. I have set up 3cx as a digitial receptionist and provisioned each of my extensions with an ip phone (yealink t20s and several t28s). I think I understand the concept of the DSS keys, which can be programmed to dial other extensions or perform actions, but I dont really understand how to get the most out of the "line" keys. As it stands the line one represents the extension and lists the extension number. I have several hard lines coming in via grandstream gxw4108, several callcentric lines and skype lines. I would like the receptionist to control and see as many of the active calls on her phone as possible, and handle all incoming and some outgoing calls. Can someone educate me as to how to best program the line keys on these phones or point me in the right direction for information? Thanks.