Why Is it So Hard to Find a DECT Telephone with a Headphone Jack?

I need a new telephone for my home office, and I really like using headphones when I talk, so I can type while talking with clients, and so I don’t have to hold the phone in my hand and keep my arm raised at other times. I live in France, and there are essentially two brands of telephones available: Siemens (Gigaset) and Philips. (There are many other brands, but they only sell the most basic telephones.)

After doing some research, the only phone I could find that has the ability to connect a headset is the Gigaset SL400. It has a mini USB jack, which you can use to transfer data, and which also allows you to connect a headset. I bought this phone, and bought a mini USB > 3.5 mm adapter, but I get no sound out of my headphones. (I’ve contacted Siemens’ support, which is supposed to get back to me, but the call-center person I talked to didn’t even understand what I wanted to do.) The SL400 does have Bluetooth, but I hate Bluetooth earpieces, and the connection takes several seconds, which is annoying.

I like this phone a lot, but I want a DECT phone that allows me to connect headphones, period. I’m surprised that this seems to be rare, at least in Europe. One friend in the US has an older Motorola phone with a headphone jack, but Motorola sells very few phones here.

It’s odd that you are expected to hold a phone like this in your hand, while all mobile phones come with hands-free kits. This is especially the case for people who use these phones in offices, and may need to use their hands while talking, as I often do when working with clients on the phone.

So, any suggestions? Has anyone found a phone like this?