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    <p>I tested and it works fine for me. Have you enabled that part of
      config by defining WITH_VOICEMAIL?</p>
    <p>Here is the debug output:</p>
    <p>$ ./utils/kamctl/kamctl rpc cfg.sets voicemail srv_ip "1.2.3.4"</p>
    <p>20(78364) DEBUG: jsonrpcs [jsonrpcs_fifo.c:445]:
      jsonrpc_fifo_server(): preparing to execute fifo jsonrpc
      [{"jsonrpc": "2.0", "method": "cfg.sets", "params": ["voicemail",
      "srv_ip", "1.2.3.4"], "reply_name": "kamailio_receiver_78376",
      "id": 78376}]<br>
      20(78364) INFO: <core> [core/cfg/cfg_ctx.c:615]:
      cfg_set_now(): INFO: cfg_set_now(): voicemail.srv_ip has been
      changed to "1.2.3.4"<br>
      20(78364) DEBUG: jsonrpcs [jsonrpcs_fifo.c:457]:
      jsonrpc_fifo_server(): command executed - result:
      [kamailio_receiver_78376] [200] [0x7fa543501660] [{<br>
          "jsonrpc":    "2.0",<br>
          "result":    {<br>
          },<br>
          "id":    78376<br>
      }]<br>
      {<br>
        "jsonrpc":  "2.0",<br>
        "result": {<br>
        },<br>
        "id": 78376<br>
      }</p>
    <p>Cheers,<br>
      Daniel<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 10/01/2017 17:24, Daniel-Constantin
      Mierla wrote:<br>
    </div>
    <blockquote
      cite="mid:8260c1ff-e186-00cf-3eb1-6ea67872e356@gmail.com"
      type="cite">
      <meta content="text/html; charset=utf-8" http-equiv="Content-Type">
      <p>Not much info there, I will have to reproduce it myself ...</p>
      <p>Cheers, Daniel<br>
      </p>
      <br>
      <div class="moz-cite-prefix">On 10/01/2017 14:44, Annus Fictus
        wrote:<br>
      </div>
      <blockquote
        cite="mid:e2863066-060d-f8c7-46cd-d8766684a362@gmail.com"
        type="cite">
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          http-equiv="Content-Type">
        <p>Jan 10 08:41:31 sip10 /sbin/kamailio[5424]: DEBUG: ctl
          [../../io_wait.h:380]: io_watch_add(): DBG:
          io_watch_add(0x7fd2e37d4300, 10, 3, 0x2353100), fd_no=1<br>
          Jan 10 08:41:31 sip10 /sbin/kamailio[5424]: DEBUG: ctl
          [io_listener.c:442]: handle_new_connect(): handle_stream read:
          new connection (1) on /var/run/kamailio//kamailio_ctl<br>
        </p>
        Thank you<br>
        <br>
        Raegards<br>
        <br>
        <div class="moz-cite-prefix">El 10/01/2017 a las 08:35,
          Daniel-Constantin Mierla escribió:<br>
        </div>
        <blockquote
          cite="mid:2c838d6e-edac-0c86-87f6-2dcabca566b6@gmail.com"
          type="cite">
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          <p>Hello,</p>
          <p>can you provide the log messages when executing the command
            with debug=3 in kamailio.cfg?</p>
          <p>Cheers,<br>
            Daniel<br>
          </p>
          <br>
          <div class="moz-cite-prefix">On 10/01/2017 13:55, Annus Fictus
            wrote:<br>
          </div>
          <blockquote
            cite="mid:c50b4c4f-4cd7-c765-6579-41b2100f57f1@gmail.com"
            type="cite">
            <meta content="text/html; charset=utf-8"
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            <p>Hi,</p>
            <p>kamcmd cfg.sets voicemail srv_ip "1.2.3.4"</p>
            <p>return<br>
            </p>
            <p><b>error: 400 - Failed to set the variable</b><br>
            </p>
            Thank you<br>
            <br>
            Regards<br>
            <br>
            <div class="moz-cite-prefix">El 10/01/2017 a las 06:01,
              Daniel-Constantin Mierla escribió:<br>
            </div>
            <blockquote
              cite="mid:ed1f9f0a-3858-b936-49d2-5d194da77b90@gmail.com"
              type="cite">kamcmd cfg.sets voicemail srv_ip "1.2.3.4"</blockquote>
            <br>
            <br>
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            <br>
            <pre wrap="">_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
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</pre>
          </blockquote>
          <br>
          <pre class="moz-signature" cols="72">-- 
Daniel-Constantin Mierla
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a>
Kamailio World Conference - May 8-10, 2017 - <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="http://www.kamailioworld.com">www.kamailioworld.com</a></pre>
          <br>
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          <br>
          <pre wrap="">_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
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</pre>
        </blockquote>
        <br>
        <br>
        <fieldset class="mimeAttachmentHeader"></fieldset>
        <br>
        <pre wrap="">_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:sr-users@lists.sip-router.org">sr-users@lists.sip-router.org</a>
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users">http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users</a>
</pre>
      </blockquote>
      <br>
      <pre class="moz-signature" cols="72">-- 
Daniel-Constantin Mierla
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a>
Kamailio World Conference - May 8-10, 2017 - <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="http://www.kamailioworld.com">www.kamailioworld.com</a></pre>
    </blockquote>
    <br>
    <pre class="moz-signature" cols="72">-- 
Daniel-Constantin Mierla
<a class="moz-txt-link-abbreviated" href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a class="moz-txt-link-abbreviated" href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a>
Kamailio World Conference - May 8-10, 2017 - <a class="moz-txt-link-abbreviated" href="http://www.kamailioworld.com">www.kamailioworld.com</a></pre>
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