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    <div class="moz-cite-prefix"><tt>Place a xlog message inside the IF
        statement, to see if you ever get there :<br>
        <br>
      </tt><br>
                      if ($stat(active_dialogs)&gt;=1){<br>
                      xlog("we have more than 1 call(s) - currently
      $stat(active_dialogs) \n");<br>
                      sl_send_reply("503", "Service Unavailable");<br>
                 <b>    exit;</b><br>
                      }
      <pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="moz-txt-link-freetext" href="http://www.opensips-solutions.com">http://www.opensips-solutions.com</a></pre>
      On 15.07.2014 12:28, jing wrote:<br>
    </div>
    <blockquote cite="mid:tencent_0F2B992D67CEA29059A3FC30@qq.com"
      type="cite">
      <div>hi,Bogdan<br>
      </div>
      <div>I have tried ,  but it is no change to have exit.</div>
      <div>regards,</div>
      <div><br>
      </div>
      <div><br>
      </div>
      <div style="font-size: 12px;font-family: Arial Narrow;padding:2px
        0 2px 0;">------------------ 原始邮件 ------------------</div>
      <div style="font-size: 12px;background:#efefef;padding:8px;">
        <div><b>发件人:</b> "Bogdan-Andrei
          Iancu"<a class="moz-txt-link-rfc2396E" href="mailto:bogdan@opensips.org">&lt;bogdan@opensips.org&gt;</a>; </div>
        <div><b>发送时间:</b> 2014年7月15日(星期二) 下午5:26</div>
        <div><b>收件人:</b> "jing "<a class="moz-txt-link-rfc2396E" href="mailto:605507247@qq.com">&lt;605507247@qq.com&gt;</a>;
          "users"<a class="moz-txt-link-rfc2396E" href="mailto:users@lists.opensips.org">&lt;users@lists.opensips.org&gt;</a>; </div>
        <div><b>主题:</b> Re: 回复: [OpenSIPS-Users] 回复: 回复: Dialog
          Concurrency Control Issue.</div>
      </div>
      <div><br>
      </div>
      <div class="moz-cite-prefix"><tt>Because you need to have an
          "exit;" after the sl_send_reply():<br>
          <br>
        </tt><br>
                        if ($stat(active_dialogs)&gt;=1){<br>
                        sl_send_reply("503", "Service Unavailable");<br>
                   <b>    exit;</b><br>
                        }<br>
        <br>
        Otherwise the script execution will continue.<br>
        <br>
        Regards,<br>
        <pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://www.opensips-solutions.com" target="_blank">http://www.opensips-solutions.com</a></pre>
        On 15.07.2014 12:19, jing wrote:<br>
      </div>
      <blockquote cite="mid:tencent_48ED3AD33206F1B3771E1C3D@qq.com"
        type="cite">
        <div>hi,Bogdan.</div>
        <div> </div>
        <div>I just want to limit the total number of active dialog. And
          now I have 2 questions .</div>
        <div> </div>
        <div>I changed the script like this:</div>
        <div> </div>
        <div>if (is_method("INVITE")) {<br>
                          xlog("active dialog is
          $stat(active_dialogs)");<br>
                          xlog("dlgcount is $DLG_count");<br>
                          if ($stat(active_dialogs)&gt;=1){<br>
                          sl_send_reply("503", "Service Unavailable");<br>
          <br>
                          }<br>
                          # create dialog with timeout<br>
                          if ( !create_dialog("B") ) {<br>
                                  send_reply("500","Internal Server
          Error");<br>
                                  exit;<br>
                          }</div>
        <div>                setflag(ACC_DO); # do accounting<br>
                  }<br>
        </div>
        <div>Then I started 3 dialog, they were all successful , but no
          503 sent. The log showed:</div>
        <div>
          <div>active dialog is 2<br>
            dlgcount is 2</div>
        </div>
        <div> </div>
        <div>I used opensipsctl fifo command to show the dialog
          statistics, it showed </div>
        <div>dialog:active_dialogs = 3.</div>
        <div>1.what is wrong in my script ?</div>
        <div>2. How to end the dialogs which have been active long time
          ,but have no response.</div>
        <div> </div>
        <div>Or is there other way to limit the total number of active
          dialog?</div>
        <div> </div>
        <div>I am a newbie to opensips,  would you please tell me more
          detailed advice?</div>
        <div>Very thanks!</div>
        <div>kind regards</div>
        <div> </div>
        <div><br>
        </div>
        <div><br>
        </div>
        <div style="PADDING-BOTTOM: 2px; PADDING-LEFT: 0px;
          PADDING-RIGHT: 0px; FONT-FAMILY: Arial Narrow; FONT-SIZE:
          12px; PADDING-TOP: 2px">------------------ 原始邮
          件 ------------------</div>
        <div style="PADDING-BOTTOM: 8px; PADDING-LEFT: 8px;
          PADDING-RIGHT: 8px; BACKGROUND: #efefef; FONT-SIZE: 12px;
          PADDING-TOP: 8px">
          <div><b>发件人:</b> "Bogdan-Andrei Iancu"<a
              moz-do-not-send="true" class="moz-txt-link-rfc2396E"
              href="mailto:bogdan@opensips.org" target="_blank">&lt;bogdan@opensips.org&gt;</a>;
          </div>
          <div><b>发送时间:</b> 2014年7月15日(星期二) 下午4:43</div>
          <div><b>收件人:</b> "users"<a moz-do-not-send="true"
              class="moz-txt-link-rfc2396E"
              href="mailto:users@lists.opensips.org" target="_blank">&lt;users@lists.opensips.org&gt;</a>;
            "jing "<a moz-do-not-send="true"
              class="moz-txt-link-rfc2396E"
              href="mailto:605507247@qq.com" target="_blank">&lt;605507247@qq.com&gt;</a>;
          </div>
          <div><b>主题:</b> Re: [OpenSIPS-Users] 回复: 回复: Dialog
            Concurrency Control Issue.</div>
        </div>
        <div><br>
        </div>
        <div class="moz-cite-prefix"><tt>Hi,<br>
            <br>
            I see you added the missing "exit" after the sl_send_reply()
            and you do create the dialog for each INVITE (hopefully only
            for the initial ones :) ). <br>
            <br>
            What seems to be the exact problem now ?<br>
            <br>
            Regards,<br>
          </tt>
          <pre class="moz-signature" cols="72">Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a class="moz-txt-link-freetext" href="http://www.opensips-solutions.com" target="_blank" moz-do-not-send="true">http://www.opensips-solutions.com</a></pre>
          On 15.07.2014 05:21, jing wrote:<br>
        </div>
        <blockquote cite="mid:tencent_6BBDD6C6338F7B911A4403D3@qq.com"
          type="cite">
          <div>hi,Schneur.</div>
          <div>Thanks for your advice.</div>
          <div>But I did put the check before  create_dialog("B")  in
            the original oprnsips.cfg:</div>
          <div> </div>
          <div>if (is_method("INVITE")) {<br>
                            xlog("active dialog is
            $stat(active_dialogs)");</div>
          <div>                if ($stat(active_dialogs)&gt;=1){<br>
                            sl_send_reply("503", "Service Unavailable");<br>
                            exit;<br>
                            }<br>
                            # create dialog with timeout<br>
                            if ( !create_dialog("B") ) {<br>
                                    send_reply("500","Internal Server
            Error");<br>
                                    exit;<br>
                            }</div>
          <div>                setflag(ACC_DO); # do accounting<br>
                    }</div>
          <div> </div>
          <div>
            <div><br>
            </div>
            <div>So what is wrong in the script?</div>
            <div>And I still want to know how to judge a call is
              "active_dialogs"?</div>
            <div>Thanks a lot.</div>
            <div> </div>
            <div>regards,</div>
            <div>jing<br>
            </div>
            <div style="PADDING-BOTTOM: 2px; PADDING-LEFT: 0px;
              PADDING-RIGHT: 0px; FONT-FAMILY: Arial Narrow; FONT-SIZE:
              12px; PADDING-TOP: 2px">------------------ 原始邮
              件 ------------------</div>
            <div style="PADDING-BOTTOM: 8px; PADDING-LEFT: 8px;
              PADDING-RIGHT: 8px; BACKGROUND: #efefef; FONT-SIZE: 12px;
              PADDING-TOP: 8px">
              <div><b>发件人:</b> "Schneur Rosenberg";<a
                  class="moz-txt-link-rfc2396E"
                  href="mailto:rosenberg11219@gmail.com" target="_blank"
                  moz-do-not-send="true">&lt;rosenberg11219@gmail.com&gt;</a>;</div>
              <div><b>发送时间:</b> 2014年7月14日(星期一) 晚上6:25</div>
              <div><b>收件人:</b> "OpenSIPS users mailling list"<a
                  class="moz-txt-link-rfc2396E"
                  href="mailto:users@lists.opensips.org" target="_blank"
                  moz-do-not-send="true">&lt;users@lists.opensips.org&gt;</a>;
                <wbr></div>
              <div><b>主题:</b> Re: [OpenSIPS-Users]回复: Dialog Concurrency
                Control Issue.</div>
            </div>
            <div><br>
            </div>
            <p dir="ltr">You need to do this before the create_dialog()
              call</p>
            <div class="gmail_quote">On Jul 14, 2014 10:33 AM, "jing"
              &lt;<a href="mailto:605507247@qq.com" target="_blank"
                moz-do-not-send="true">605507247@qq.com</a>&gt; wrote:<br
                type="attribution">
              <blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN:
                0px 0px 0px 0.8ex; PADDING-LEFT: 1ex"
                class="gmail_quote">
                <div><font color="#000000">Thanks for your reply.But I
                    have another question, I used  active_dialogs </font><font
                    color="#000000"> in the cfg file as this:</font></div>
                <div> </div>
                <div><font color="#000000">if (is_method("INVITE")) {<br>
                                    if ($stat(active_dialogs)&gt;=1){<br>
                                    sl_send_reply("503", "Service
                    Unavailable");<br>
                                    }<br>
                  </font></div>
                <div><font color="#000000">
                    <div><font color="#000000">But it seems not right. </font></div>
                    <div><font color="#000000">I use sipp to test the
                        limit ,but when the value of active_dialogs</font><font
                        color="#000000"> aim to the number I set ,</font></div>
                    <div><font color="#000000">opensips sent 503,but 
                        the value of active_dialogs<font color="#000000"> </font>sitll
                        increase. </font></div>
                    <div><font color="#000000">So I want to know how the
                        value of this paramer come</font><font
                        color="#000000">from.</font></div>
                    <div><font color="#000000">Or is there something
                        wrong in my cfg document?</font></div>
                    <div> </div>
                    <div>regards,</div>
                    <div>Jing</div>
                  </font></div>
                <div><br>
                </div>
                <div><br>
                </div>
                <div style="PADDING-BOTTOM: 2px; PADDING-LEFT: 0px;
                  PADDING-RIGHT: 0px; FONT-FAMILY: Arial Narrow;
                  FONT-SIZE: 12px; PADDING-TOP: 2px">------------------ 原
                  始 邮 件 ------------------</div>
                <div style="PADDING-BOTTOM: 8px; PADDING-LEFT: 8px;
                  PADDING-RIGHT: 8px; BACKGROUND: #efefef; FONT-SIZE:
                  12px; PADDING-TOP: 8px">
                  <div><b>发件人:</b> "Schneur Rosenberg [via OpenSIPS
                    (Open SIP Server)]"&lt;<a
                      href="http://user/SendEmail.jtp?type=node&amp;node=7592371&amp;i=0"
                      rel="nofollow" target="_blank"
                      moz-do-not-send="true" link="external">[hidden
                      email]</a>&gt;; </div>
                  <div><b>发送时间:</b> 2014年7月14日(星期一) 下午2:08</div>
                  <div><b>收件人:</b> "jing "&lt;<a
                      href="http://user/SendEmail.jtp?type=node&amp;node=7592371&amp;i=1"
                      rel="nofollow" target="_blank"
                      moz-do-not-send="true" link="external">[hidden
                      email]</a>&gt;; </div>
                  <div><b>主题:</b> Re: Dialog Concurrency Control Issue.</div>
                </div>
                <div><br>
                </div>
                <p dir="ltr">Very simple, before creating a new dialog
                  check how many open dialogs exist.</p>
                <div class="gmail_quote">On Jul 14, 2014 9:05 AM, "jing"
                  &lt;<a
                    href="http://user/SendEmail.jtp?type=node&amp;node=7592369&amp;i=0"
                    rel="nofollow" target="_blank"
                    moz-do-not-send="true" link="external">[hidden
                    email]</a>&gt; wrote:<br type="attribution">
                  <blockquote style="BORDER-LEFT: #cccccc 2px solid;
                    PADDING-BOTTOM: 0px; PADDING-LEFT: 1em;
                    PADDING-RIGHT: 1em; PADDING-TOP: 0px"
                    class="gmail_quote">hi,Bogdan<br>
                    <br>
                    <br>
                     I want to limit the total number of active dialogs
                    ,what should I do ?<br>
                    <br>
                    I found there are many questions about "Concurrent
                    calls limitation " based<br>
                    on per user, it's not what I need.<br>
                    <br>
                    I appreciate your advice very much,  more detailed
                    the better.<br>
                    <br>
                    Thanks,<br>
                    Regards,<br>
                    jing<br>
                    <br>
                    <br>
                    <br>
                    --<br>
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