Simulate missed call from ADB shell

On the ADB shell, I run the command adb -s shell am start -a android.intent.action.CALL -d tel:123456 to place a call on my testing device. It works great. But I also want to simulate a missed call from the ADB shell, as I would by telnet with the command gsm cancel +123456, for example. I cannot find anywhere how to do this. Is this even possible with ADB? If so, how? P.S: the command adb -s shell input keyevent 6 is not an answer!