Emits the <link linkend="gdbus-signal-org-freedesktop-ModemManager1-Call.
StateChanged">"StateChanged"</link> D-Bus signal.
| this |
A GdbusCall. |
| arg_old |
Argument to pass with the signal. |
| arg_new |
Argument to pass with the signal. |
| arg_reason |
Argument to pass with the signal. |