uas_im.xml

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE scenario SYSTEM "sipp.dtd">

<!--                                                                    -->
<!--                   Instant Message Simulator                        -->
<!--                         (Server Mode)                              -->
<!--                                                                    -->
<!--                     A                   B                          -->
<!--                     |(1)    INVITE      |                          -->
<!--                     |<==================|                          -->
<!--                     |(2)    200 OK      |                          -->
<!--                     |==================>|                          -->
<!--                     |...................|                          -->
<!--                                                                    -->

<scenario name="IM Simulator">
  <recv request="MESSAGE" crlf="true">
  </recv>

  <send>
    <![CDATA[

      SIP/2.0 200 OK
      [last_Via:]
      [last_From:]
      [last_To:];tag=[call_number]
      [last_Call-ID:]
      [last_CSeq:]
      Contact: <sip:[local_ip]:[local_port];transport=[transport]>
      Content-Length: 0
      
    ]]>
  </send>

</scenario>