At the begganing i want to say sorry for all mistakes cause I'm working on Avaya equpiment, not NEC.
I have a client who wants to connect DT700 phone series from old NEC system to new Avaya Session Manager. I'm not able to do it, always I'm getting "server error" or somethink like that. I found in Google informations about this case and someone wrote: "You need open sip firmware for these phones if you want to connect it to 3th part systems". So my question is it true? If yes can I ask for share it? I don't have access to NEC support website...