Yes Sennheiser is Jabber certified. However, it depends on the version. Jabber 10 works fine, older versions still need a smaller plug-on which can be installed via the Jabber software.

I have the Gigaset DX800a phone in my office and need a headset to go with it. This phone does not have a headset connection but it does have Bluetooth. Can I connect this headset to this phone and use it to pick up and hang up the phone calls on the headset?