Messages are transported to and from service destinations over message channels that are part of the Flex messaging system

AMF polling channels are not supported.

<channels>
  <channel-definition id="my-amf" class="mx.messaging.channels.AMFChannel">
    <endpoint uri="http://{server.name}:{server.port}/{context.root}/Gateway.aspx" class="flex.messaging.endpoints.AMFEndpoint"/>
  </channel-definition>

  <channel-definition id="my-rtmp" class="mx.messaging.channels.RTMPChannel">
    <endpoint uri="rtmp://{server.name}:1951" class="flex.messaging.endpoints.RTMPEndpoint"/>
  </channel-definition>
</channels>