Via Joe the UCX Guy from 2016, if memory serves me.
It’s alive and well. This is an older telset from October 22nd, 2002. Private label from Shoreline Communications that would become ShoreTel that in full circle merged with Mitel just over a year ago whom of which also acquired Aastra a few years back.
Go ahead and make your head spin as I still can’t get over how Polycom and Plantronics tied the knot and a distro company buying the source code (Sagnoma/Free PBX> Digium/Asterisk.) These were just within year to date mergers.
Ironically the base actually apparently came from one of my 480i’s and fits the same, however if you try to feed in a Cat 5 cable in a 390 base, it won’t fit for 1, and 2 there is only three indent paths for handset, line and AC adaptor (yes if you so want to make your handset cable more flat and extend a few more inches than really needed to look so fancy, you can.
Unboxing video from the time:
https://www.youtube.com/watch?v=h_RDfR0XmEU