Helper function used in service implementations to finish handling invocations of the <link linkend="gdbus-method-org-freedesktop-ModemManager1-Modem-Oma.
AcceptNetworkInitiatedSession">AcceptNetworkInitiatedSession</link> D-Bus method. If you instead want to finish
handling an invocation by returning an error, use
return_error or similar.
This method will free invocation, you cannot use it afterwards.
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