Azure Service Bus Topic Receiving messages

Referring to, I understand how Azure Service Bus Topics work in general, my question is more about how it actually works.

When a MesageHandler is registered (subscriptionClient.RegisterMessageHandler), it starts receiving messages as I see in

Console.WriteLine($"Received message: SequenceNumber:{message.SystemProperties.SequenceNumber} Body:{Encoding.UTF8.GetString(message.Body)}");

However, my question is whether the client actually receives the messages using a pull mode or it is a push from the Service Bus? Is there a continuous polling done by the Client to receive the messages - how does this work internally?

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