The original software was built for Windows XP. Running it on modern Windows 10/11 requires finesse.
I bought a Panasonic KX-TD1232 on eBay for $50. I’ve spent 300 hours trying to change the voicemail greeting. panasonic kxtd1232 programming software
If you prefer not to use software, you can program the system directly through a digital proprietary phone (usually connected to ): KX-TD1232 Programming Questions - Tek-Tips The original software was built for Windows XP