[mdphoenix]

I've discovered that the button needs to be pressed once. The first time it's pressed to hang up, I guess it establishes some sort of connection that tells the phone to accept commands. The second time I press it, it will hang up. If I wait about 8 seconds to press it a second time, the hang up is immediate. If I press it twice in a row, it waits about 8 seconds to hang up. Seems like it's taking a while for phone to get the info from the device.