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    I have the exact same condition with chan_ss7 on Asterisk 1.4 and
    Asterisk 1.8 and can confirm that I've run all versions of chan_ss7
    from 1.3 up to 2.1.0 (2.1.0 on Asterisk 1.8 and the previous
    versions on Asterisk 1.4).<br>
    <br>
    The remote end is, to the best of my knowledge, a Siemens EWSD.<br>
    <br>
    The following feedback was provided by the remote carrier and may
    prove useful in explaining the problem:<br>
    <p class="MsoNormal" style="text-autospace:none"><span
        style="font-size:9.0pt;font-family:Fixedsys">SWTNRB&nbsp;&nbsp;&nbsp;&nbsp; 26&nbsp;&nbsp;&nbsp;
        1-26&nbsp; TRUNK&nbsp;&nbsp;&nbsp; BW&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0-24 2-26&nbsp;&nbsp; IDLE&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p>
    <p class="MsoNormal" style="text-autospace:none"><span
        style="font-size:9.0pt;font-family:Fixedsys">SWTNRB&nbsp;&nbsp;&nbsp;&nbsp; 27&nbsp;&nbsp;&nbsp;
        1-27 &nbsp;TRUNK&nbsp;&nbsp;&nbsp; BW&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0-24 2-27&nbsp;&nbsp; INC&nbsp; &amp;&nbsp; <o:p></o:p></span></p>
    <p class="MsoNormal" style="text-autospace:none"><span
        style="font-size:9.0pt;font-family:Fixedsys">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FRCD
        &amp;&nbsp; <o:p></o:p></span></p>
    <p class="MsoNormal" style="text-autospace:none"><span
        style="font-size:9.0pt;font-family:Fixedsys">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;IALM&nbsp;&nbsp;&nbsp;
        <o:p></o:p></span></p>
    <p class="MsoNormal" style="text-autospace:none"><span
        style="font-size:9.0pt;font-family:Fixedsys">SWTNRB&nbsp;&nbsp;&nbsp;&nbsp; 28&nbsp;&nbsp;&nbsp;
        1-28&nbsp; TRUNK&nbsp;&nbsp;&nbsp; BW&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0-24 2-28&nbsp;&nbsp; IDLE&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p>
    <p class="MsoNormal" style="text-autospace:none"><span
        style="font-size:9.0pt;font-family:Fixedsys">SWTNRB&nbsp;&nbsp;&nbsp;&nbsp; 29&nbsp;&nbsp;&nbsp;
        1-29&nbsp; TRUNK&nbsp;&nbsp;&nbsp; BW&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0-24 2-29&nbsp;&nbsp; INC&nbsp; &amp;&nbsp; <o:p></o:p></span></p>
    <p class="MsoNormal" style="text-autospace:none"><span
        style="font-size:9.0pt;font-family:Fixedsys">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FRCD
        &amp;&nbsp; <o:p></o:p></span></p>
    <p class="MsoNormal" style="text-autospace:none"><span
        style="font-size:9.0pt;font-family:Fixedsys">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;IALM&nbsp;&nbsp;&nbsp;
        <o:p></o:p></span></p>
    <p class="MsoNormal"><span
        style="font-size:9.0pt;font-family:Fixedsys">SWTNRB&nbsp;&nbsp;&nbsp;&nbsp; 30&nbsp;&nbsp;&nbsp;
        1-30&nbsp; TRUNK&nbsp;&nbsp;&nbsp; BW&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0-24 2-30&nbsp;&nbsp; IDLE&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p>
    <p class="MsoNormal"><span
        style="font-size:9.0pt;font-family:Fixedsys"><o:p>&nbsp;</o:p></span></p>
    <p class="MsoNormal"><span
        style="font-size:9.0pt;font-family:Fixedsys">With the IALM
        condition is caused by &#8220;end of optional parameter in the wrong
        place&#8221;.<o:p></o:p></span></p>
    <p class="MsoNormal"><span
        style="font-size:9.0pt;font-family:Fixedsys">If you should see
        in the attachment I have highlighted the REL and RLC message
        from your nodes.<o:p></o:p></span></p>
    <p class="MsoNormal"><span
        style="font-size:9.0pt;font-family:Fixedsys">Both of these have
        the optional parameter &#8220;indicated&#8221;.<o:p></o:p></span></p>
    <p class="MsoNormal"><span
        style="font-size:9.0pt;font-family:Fixedsys">If it is possible
        can you please &nbsp;set optional parameters OFF ( parameter
        indicator =0) for <o:p></o:p></span></p>
    <p class="MsoNormal"><span
        style="font-size:9.0pt;font-family:Fixedsys">These two messages.<o:p></o:p></span></p>
    <span style="font-size:9.0pt;font-family:Fixedsys">If you can let me
      know so that we can reset the circuits as we have done previously.<br>
      <br>
    </span><br>
    They also provided the following:<br>
    <meta http-equiv="CONTENT-TYPE" content="text/html;
      charset=ISO-8859-1">
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">Octet001
          ITU-T SS7 Count=000001 Time=08/22/2011 13:21:14:023 </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">10010010
          BIB/BSN (146) 1/18 </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">11111001
          FIB/FSN (249) 1/121 </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">..001110
          SU
          type/length (14) MSU14 </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">00......
          Spare 0</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">Octet004
          Service information octet </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">....0101
          Service indicator (5) ISUP ISDN User Part </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">..00....
          Message priority 0</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">11......
          Network indicator (3) NAT1 National network </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">Octet005
          Routing label </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">........
          DPC 01-1-03-0 JNL#1 </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm"> <tt><font size="2"><span
            lang="en-ZA">........ </span></font><font color="#ff0000"><font
            size="2"><span lang="en-ZA">OPC 00-6-01-0 SWITCHTEL </span></font></font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">1001....
          SLS 9</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">Octet009
          Circuit identification code </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">........
          CIC 217</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">0000....
          Spare 0</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">Octet011
          ISUP Release message </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">00001100
          Message type (12) REL Release </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">00000010
          Pointer-&gt;cause 2</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm"> <tt><font color="#ff0000"><font
            size="2"><span lang="en-ZA">00000100 Pointer-&gt;optionals 4</span></font></font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">Octet014
          Cause indicators parameter </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">00000010
          Parameter length 2</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">....0101
          Location (5) Private network serving the remote user
          (RPN) </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">...0....
          Spare 0</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">.00.....
          Coding standard (0) CCITT standard </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">1.......
          Extension bit (1) Last octet </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">.0010000
          Cause (16) Normal call clearing </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">1.......
          Extension bit (1) Last octet </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">Octet017
          ISUP End of optional parameters </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">00000000
          Parameter name code (0) ISUP End of optional parameters </font></tt>
    </p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"> <tt><font size="2">Checksum
          CRC16................ 0001110100001111 hex=1D0F</font></tt></p>
    <tt>
    </tt>
    <p style="margin-bottom: 0cm" lang="en-ZA"><tt><font size="2">--------------------------------------------------------------------------------</font></tt></p>
    <tt>
    </tt>
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    <br>
    As far as I am aware, there is no way to disable the optionals in
    chan_ss7.<br>
    <br>
    Interestingly, the is not on all REL and RLC messages, only some of
    them.<br>
    <br>
    I guess it's time to look through the source code, but this hasn't
    proven terribly problematic for me thus far because it's only a few
    random CICs that block in that state. It seems the remote end does
    eventually remove the admin block by itself after a certain amount
    of time, but restarting asterisk or chan_ss7 won't help. Usually I
    just get the guys on the remote end to manually clear the condition.<br>
    <br>
    On 2011/11/21 10:35 AM, Stefan Schmidt wrote:
    <blockquote cite="mid:4ECA0D45.8050506@sil.at" type="cite">
      <pre wrap="">Hello list,

i have two E1 running on a asterisk 1.8 with chan_ss7 which i have set
to production state last week. And after around 5000 calls i can see
that 3 channels are in state BLOCKED Remote Maintenance. My carrier said
he hasnt blocked anything on this two E1 lines but he can see some
messages even on busy lines he doesnt understand.

Asterisk was automatically restarted every night but these three
channels stay at this state.

Is this a known bug or what can i do to solve this problem?

asterisk verison 1.8 (Asterisk SVN-schmidts-unleash-the-beast-r343849)
chan_ss7 version (chan_ss7 version 2.1.0) but with some patches to isup
for connected line information and also the patch for the additional
calling party header.

thanks!

best regards

stefan schmidt

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