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    I noticed openr2 doesn't discard signalling if the fixed bits
    (usually 01) are different from the proper settings.<br>
    I changed src/r2proto.c, function openr2_proto_handle_cas:<br>
    <br>
       adding:<br>
     if ((cas &amp; 3) != r2chan-&gt;r2context-&gt;cas_nonr2bits)<br>
     { // Treat NON CAS bits diferent than expected as an invalid CAS
    bits<br>
       r2chan-&gt;cas_tx_signal = OR2_CAS_INVALID;<br>
       return 0;<br>
      }<br>
      /* pick up only the R2 bits */ &lt;- This comment already existed<br>
    <br>
    In addition, ignore alarms (continue handling input CAS bits as
    normal).<br>
    Now searching for that pesky bleed through of configurations of
    spans with 15 or less channels.<br>
    <br>
    On 01/10/12 20:42, Moises Silva wrote:
    <blockquote
cite="mid:CAA4nhyCYxV51AGF4BaHkyjytpLUZoFbaMVU=i11ih+mdWUDfAQ@mail.gmail.com"
      type="cite">
      <div class="gmail_quote">On Tue, Jan 10, 2012 at 5:30 PM, Marcelo
        Pacheco <span dir="ltr">&lt;<a moz-do-not-send="true"
            href="mailto:marcelo@m2j.com.br">marcelo@m2j.com.br</a>&gt;</span>
        wrote:<br>
        <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
          0.8ex; border-left: 1px solid rgb(204, 204, 204);
          padding-left: 1ex;"> I have the following chan_dahdi.conf
          (asterisk 1.6.2.18 / dahdi 2.3.0.1 / openR2 1.3.1):<br>
          <br>
          [channels]<br>
          usecallerid=yes<br>
          echocancel=no<br>
          echocancelwhenbridged=no<br>
          <br>
          signalling=mfcr2<br>
          mfcr2_variant=br<br>
          mfcr2_forced_release=no<br>
          mfcr2_get_ani_first=no<br>
          mfcr2_category=national_subscriber<br>
          mfcr2_allow_collect_calls=yes<br>
          mfcr2_double_answer=no<br>
          <br>
          context=entrada<br>
          group=1<br>
          mfcr2_max_ani=14<br>
          mfcr2_max_dnis=4<br>
          channel =&gt; 1-15,17-21<br>
          <br>
          context=geral<br>
          group=2<br>
          mfcr2_max_ani=4<br>
          mfcr2_max_dnis=16<br>
          channel =&gt; 32-46,48-52<br>
          <br>
          And the following /etc/dahdi/system.conf<br>
          <br>
          span=1,1,0,cas,hdb3<br>
          span=2,0,0,cas,hdb3<br>
          span=3,0,0,esf,b8zs<br>
          span=4,0,0,ccs,hdb3<br>
          cas=1-15,17-21:1101<br>
          cas=32-46,48-52:1101<br>
          fxoks=63-86<br>
          bchan=87-101,103-117<br>
          dchan=102<br>
          echocanceller=mg2,1-15,17-21,32-46,48-52,63-86<br>
          loadzone = us<br>
          defaultzone=us<br>
          <br>
          <br>
          /etc/asterisk/chan_dahdi.conf (removed the comments to save
          space)<br>
          <br>
          [channels]<br>
          usecallerid=yes<br>
          callwaiting=no<br>
          usecallingpres=yes<br>
          callwaitingcallerid=yes<br>
          threewaycalling=yes<br>
          transfer=yes<br>
          canpark=yes<br>
          cancallforward=yes<br>
          callreturn=yes<br>
          echocancel=yes<br>
          echocancelwhenbridged=no<br>
          <br>
          group=1<br>
          callgroup=1<br>
          pickupgroup=1<br>
          <br>
          signalling=mfcr2<br>
          mfcr2_variant=br<br>
          mfcr2_forced_release=no<br>
          mfcr2_get_ani_first=no<br>
          mfcr2_category=national_subscriber<br>
          mfcr2_max_ani=14<br>
          mfcr2_max_dnis=4<br>
          mfcr2_allow_collect_calls=yes<br>
          context=entrada<br>
          group=1<br>
          channel =&gt; 1-15,17-21<br>
          <br>
          mfcr2_max_ani=8<br>
          mfcr2_max_dnis=16<br>
          context=geral<br>
          group=2<br>
          channel =&gt; 32-46,48-52<br>
          <br>
          <br>
          switchtype=euroisdn<br>
          signalling=pri_net<br>
          group=4<br>
          context=geral<br>
          channel =&gt; 87-101,103-117<br>
          <br>
          <br>
          Frequently, after we get an alarm and the alarm clears, some
          or all channels are left with Rx CAS 0xC state.<br>
          Reloading dahdi solves the issue, but it's extremely
          undesirable since this condition might leave no channels or
          very few channels in operable state for usage until restarting
          dahdi (and restarting dahdi kills all active dahdi calls). I
          just upgraded to OpenR2 1.3.2, but I saw nothing on the
          ChangeLog that might fix this.<br>
          <br>
        </blockquote>
        <div><br>
        </div>
        <div>If you can reproduce this reliably and are willing to test
          a patch, I can write one.</div>
        <div><br>
        </div>
        <div>Can you reproduce the issue easily by unplugging/plugging
          the cable multiple times to generate alarms?</div>
        <div><br class="Apple-interchange-newline">
          <table style="width: 486.3pt; border-collapse: collapse;"
            border="0" cellpadding="0" cellspacing="0" width="648">
            <tbody>
              <tr style="height: 60.55pt;">
                <td style="border-style: dotted none none; border-top:
                  1pt dotted rgb(128, 176, 214); padding: 1.45pt 5.75pt;
                  height: 60.55pt;">
                  <p style="margin: 0px; line-height: 15px;"><b><span
                        style="font-size: 8pt; line-height: 12px;
                        font-family: Arial,sans-serif; color: rgb(14,
                        93, 167);" lang="PT-BR">Moises Silva<br>
                      </span></b><b><i><span style="font-size: 8pt;
                          line-height: 12px; font-family:
                          Arial,sans-serif; color: rgb(128, 176, 214);"
                          lang="EN-CA">Software Engineer, Development
                          Manager</span></i></b><b><span
                        style="font-size: 8pt; line-height: 12px;
                        font-family: Arial,sans-serif; color: rgb(14,
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                  <p style="margin: 0px; line-height: 15px;"><span
                      style="font-size: 8pt; line-height: 12px;
                      font-family: Arial,sans-serif; color: rgb(0, 92,
                      165);" lang="EN-CA"><a moz-do-not-send="true"
                        href="mailto:msilva@sangoma.com" target="_blank">msilva@sangoma.com</a></span></p>
                  <p style="margin: 0px; line-height: 15px;"><span
                      style="font-size: 8pt; line-height: 12px;
                      font-family: Arial,sans-serif; color: rgb(0, 92,
                      165);" lang="EN-CA">Sangoma Technologies</span></p>
                  <p style="margin: 0px; line-height: 15px;"><span
                      style="font-size: 8pt; line-height: 12px;
                      font-family: Arial,sans-serif; color: rgb(0, 92,
                      165);" lang="EN-CA">100 Renfrew Drive, Suite 100,
                      Markham, ON L3R 9R6 Canada</span><span
                      style="font-size: 8pt; line-height: 12px;
                      font-family: Arial,sans-serif; color: rgb(255,
                      192, 0);" lang="EN-CA"></span></p>
                </td>
                <td style="width: 140.45pt; border-style: dotted none
                  none; border-top: 1pt dotted rgb(128, 176, 214);
                  padding: 1.45pt 5.75pt; height: 60.55pt;" width="187">
                  <p style="margin: 0px; line-height: 15px;"><span
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                </td>
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                        lang="PT-BR">Contact</span></a><span
                      style="font-size: 8pt; line-height: 12px;
                      font-family: Arial,sans-serif; color: rgb(128,
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                        lang="PT-BR">Facebook</span></a><span
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                      176, 214);" lang="PT-BR">`| | </span><a
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href="http://www.youtube.com/sangomatechnologies?utm_source=signature&amp;utm_medium=email&amp;utm_campaign=email%2Bsignatures"
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                        lang="PT-BR">YouTube</span></a><span
                      style="font-size: 8pt; line-height: 12px; color:
                      rgb(31, 73, 125);"></span></p>
                </td>
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