Lets suppose that I´m out office using my 3CX phone (via Android Smartphone or iPhone) and I need talk with a colleague, why not offer/show internal extensions as contacts? Today I call one person and ask to transfer to another one that I didn´t remember the extension number... In my previous post (http://www.3cx.com/forums/3cx-contact-why-show-other-ext-s-feat-req-21976.html) someone tell me to register the extensions as contact in my contact list. So I have one question: Is this too hard to implement a 'segmentation' or filter for contacts? It´s seems like 'Source: List from Contacts Phone, List from Extensions'. We don't have high flow to create new one/delete old extensions... You can download extension numbers and store them in a .XML file!!!