Do you stillhae the problem. I know its a bit tricky. but i got good support from RTX, If you neet. i can send you the instruction. I have got 2 of them and they work nicely. I love them, because have the possibility to use through skype or by fix line. But the start maybe a bit difficult.
My problem with Rtx is that the base station worked for 10 hours only. Seems like is not powered. A really bad product. Obv, i checked out if everything was connected.
I had exactly the same issues with the base. It worked for the first 10 hours or so and then stopped indifinetely. I quickly figured this out as I was a happy customer of their previous 3088 phone. I was so upset thinking 4088 was simply poorly executed. I have contacted RTX and they told me to contact the seller as the product was new. I contacted the seller and sent the product back, while he replaced it. The new, replaced 4088 works flawlessy for more than one year already.
Didn't read it on any 'official source' just from different post on various forums.
But now 24 hours later as is well and working again, so"no longer supported" is unfounded.