I have just taken delivery of a number of Cisco IP phones - 7940, 7960 and 7971, all of which I want to connect to 3CX. I expected them to just plug-in to my network and I would follow some simple configuration instructions that would have the phones running in minutes. They don't do that - it seems they go into an endless loop trying to connect to the network. Having read some of the forum entries I now realise that I need to convert the phones from "Cisco" format to SIP. I would like to think I am IT literate but I would have to admit my (IBM) technical experience goes back a long way and I'm not up to speed with VoIP, SIP, etc. I am also trying to save my relationship here - I promised my partner we'd have great telephones working by midnight and that's looking very doubtful! I've read all I can on this forum and on the 3CX help pages and I know I need to acquire some files from Cisco and a program to deliver them to the phones. The example I saw on the 3CX help pages used a TFTP program called Pumpkin to update the phones. I went to the link and downloaded a program called IPSentry that I assume is the same thing (it's a trial version - do I need it permanently?). I'm not familiar with TFTP so I have no idea what to do with this program now I've loaded it. My other problem is that I don't have any of the files that I apparently require to upgrade the phones and I don't have an account with Cisco (I looked at creating one but it seems that, as an "ordinary" customer who has purchased my phones from a third party I can't easily create a Cisco account). Could someone kind person take me - simply - through all the steps I need to perform to make these phones work? I (and my partner) will be eternally grateful!