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<chapter>
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      <year>2000</year><year>2009</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
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      The contents of this file are subject to the Erlang Public License,
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    <title>Transport mechanisms</title>
    <prepared>H&aring;kan Mattsson</prepared>
    <responsible>H&aring;kan Mattsson</responsible>
    <docno></docno>
    <approved>H&aring;kan Mattsson</approved>
    <checked></checked>
    <date>2007-06-15</date>
    <rev>%VSN%</rev>
    <file>megaco_transport_mechanisms.xml</file>
  </header>

  <section>
    <title>Callback interface</title>
    <p>The callback interface of the transport module contains several
      functions. Some of which are mandatory while others are only
      optional: </p>
    <list type="bulleted">
      <item>
        <p><c><![CDATA[send_message]]></c> - Send a message. <em>Mandatory</em></p>
      </item>
      <item>
        <p><c><![CDATA[block]]></c> - Block the transport. <em>Optional</em></p>
        <p>This function is usefull for flow control.</p>
      </item>
      <item>
        <p><c><![CDATA[unblock]]></c> - Unblock the transport. <em>Optional</em></p>
      </item>
    </list>
    <p>For more detail, see the 
      <seealso marker="megaco_transport">megaco_transport</seealso>
      behaviour definition.</p>
  </section>

  <section>
    <title>Examples</title>
    <p>The Megaco/H.248 application contains implementations
      for the two protocols specified by the Megaco/H.248 standard;
      UDP, see <seealso marker="megaco_udp">megaco_udp</seealso>, 
      and TCP/TPKT, see <seealso marker="megaco_tcp">megaco_tcp</seealso>. </p>
  </section>
</chapter>

