As I keep trying to point out to those who come here for this, yes someone here can supply it (try the search feature and you will find it) but it isn't worth the effort. First once you have it you then need to load it (not that easy) and then you end up with a really dumb phone that you can't...
Only do this if you want a really poor experience with the Yeastar. The NEC handsets running standard sip are really dumb and at best are only equivalent to a very old analogue phone as none of the buttons are programmable (like having an analogue phone with no speed dial buttons). If you are...
Ok so there may be the answer to the situation! Is the phone using standard sip and is the password for the standard sip firmware different to the nec firmware?
Sorry but the part number doesn't seem to match the phone see here...
https://www.telephonewreckers.com.au/nec-sl2100-ip7ww-12txh-b1-12-button-digital-phone
Stupid point here but I am assuming you have other stations working on the system so what happens if you swap this handset for a working one or is it an IP handset?
Is it even worth the effort as you end up with a pretty dumb phone and you won't be able to program keys to the phone! a cheap E bay Yealink phone would give you much more functionality!
You ask about ethernet to analogue adaptors, what do you mean by this? Are you meaning using SIP extensions or just converting analogue to ethernet then back to analogue? For that matter what small key system do you have, is it even an NEC system?
If they are all on premises, you may be able to...
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