The Blackwire 700 series headset normally wouldn't be described as a very efficient phone call manager. After all, it doesn't even have a normal audio jack.
Then again, that isn't quite the point of its existence. Rather than calls from physical smartphones and such, it has the ability to route calls received through softphones, programs used to contact others over the Internet.
Nevertheless, it also has the ability to maintain a Bluetooth connection to smartphones and tablets.
Coupled with a special sensor that knows when the headset is being worn, the Blackwire 700 can pause music automatically when a softphone or a wirelessly connected mobile device gets the figurative ring.
Blackwire 710, a single-ear headset with detachable cable and integrated clothing clip sells for $129.95 / 129.95 Euro. Blackwire 720, dual-ear Hi-Fi stereo, is priced at $149.95 / 149.95 Euro.