This event is invoked by the SMS Gateway when the
SMS is accepted by the network for delivery. If you have a slow
service provider connection (for example you use a GSM Modem)
and you are sending a lot of messages Ozeki NG will put the messages
into a message queue called outbox until there is capacity available
for sending. As soon as service provider capacity becomes available
the message is sent and the onMessageDelivedToNetwork event is invoked
To handle this event, the following delegate type is used:
public delegate void DeliveryEventHandler(string messageID, DateTime
deliveryTime);
And the following event is accessed:
public event DeliveryEventHandler onMessageDeliveredToNetwork;
Hint: Notice the ServerEventSink.wrap method, that is used to attach the event.
This wrapper is used to work around an error that can happen when
asynchronous callbacks are invoked in .NET remoting.