On the client-side, this signal is emitted whenever the D-Bus signal <link linkend="gdbus-signal-org-freedesktop-ModemManager1-Modem-Voice.
CallAdded">"CallAdded"</link> is received.
On the service-side, this signal can be used with e.g. emit_by_name to make the object emit the D-Bus signal.
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Argument. |