Back in the old days we had PTT, the dutch phone company. The only allowed phone to use was the one provided by the PTT. In the 80′ they allowed other brand of phones connected to there line, so the good old T-65 disappears to the garage.
Now the “retro” look is back in the interior design, so the T-65 is also trendy, but i wouldn’t work today anymore because it’s using puls dialing and modern pabx can only use tone dialing (DTMF). Cable, adsl modems and skype won’t work either with puls dialing.
On the net i found this simple schematic made by Frits k, it will upgrade the T-65 with DTMF and redial function. Check it out(sorry only dutch). Nice project to build.