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    On 11/22/2011 06:13 PM, Alex Vishnev wrote:
    <blockquote
      cite="mid:603CFA27-5247-4C07-95D6-E061B8412522@gmail.com"
      type="cite">
      <pre wrap="">it is strange that Aastra acks 401, sends another invite but does not increase CSeq. Is that the same behavior with others?
On Nov 22, 2011, at 11:51 AM, Jonas Kellens wrote:
</pre>
    </blockquote>
    <font face="Helvetica, Arial, sans-serif">This is a trace taken when
      an Alcatel-Lucent PBX sends an INVITE (no refusal by Asterisk). Do
      you see any difference ?<br>
      <br>
    </font><font face="Helvetica, Arial, sans-serif">A1.A1.A1.A1 =
      IP-address Asterisk PBX<br>
      AL.AL.AL.AL = IP-address Alcatel-Lucent PBX<br>
      <br>
      <br>
      &lt;--- SIP read from UDP:AL.AL.AL.AL:5060 ---&gt;<br>
      INVITE <a class="moz-txt-link-freetext" href="sip:311083335533@A1.A1.A1.A1;user=phone">sip:311083335533@A1.A1.A1.A1;user=phone</a> SIP/2.0<br>
      Allow: INVITE, ACK, CANCEL, BYE, PRACK, NOTIFY, SUBSCRIBE,
      OPTIONS, UPDATE<br>
      Supported: replaces, timer, 100rel<br>
      User-Agent: OmniPCX Enterprise R9.1 i1.605.21<br>
      Session-Expires: 1800;refresher=uac<br>
      Min-SE: 900<br>
      P-Asserted-Identity: "Dan Luc"
      <a class="moz-txt-link-rfc2396E" href="sip:328883300@192.168.8.10;user=phone">&lt;sip:328883300@192.168.8.10;user=phone&gt;</a><br>
      To: <a class="moz-txt-link-rfc2396E" href="sip:311083335533@A1.A1.A1.A1;user=phone">&lt;sip:311083335533@A1.A1.A1.A1;user=phone&gt;</a><br>
      From: "Dan Luc"
<a class="moz-txt-link-rfc2396E" href="sip:328883300@AL.AL.AL.AL:5060;user=phone">&lt;sip:328883300@AL.AL.AL.AL:5060;user=phone&gt;</a>;tag=37a49f0486bab42b240be214b2d13153<br>
      Contact: <a class="moz-txt-link-rfc2396E" href="sip:328883300@AL.AL.AL.AL:5060;transport=UDP">&lt;sip:328883300@AL.AL.AL.AL:5060;transport=UDP&gt;</a><br>
      Call-ID: <a class="moz-txt-link-abbreviated" href="mailto:2fae0b0266919172cac1e23dc2567cd2@192.168.8.10">2fae0b0266919172cac1e23dc2567cd2@192.168.8.10</a><br>
      CSeq: 443337258 INVITE<br>
      Via: SIP/2.0/UDP
      AL.AL.AL.AL:5060;branch=z9hG4bK5dee58e3294e4b7f9fe34c65af7b4cae<br>
      Max-Forwards: 70<br>
      Content-Type: application/sdp<br>
      Content-Length: 292<br>
      <br>
      v=0<br>
      o=OXE 1322045354 1322045354 IN IP4 AL.AL.AL.AL<br>
      s=abs<br>
      c=IN IP4 AL.AL.AL.AL<br>
      t=0 0<br>
      m=audio 34422 RTP/AVP 8 18 97<br>
      a=sendrecv<br>
      a=rtpmap:8 PCMA/8000<br>
      a=ptime:20<br>
      a=maxptime:30<br>
      a=rtpmap:18 G729/8000<br>
      a=fmtp:18 annexb=no<br>
      a=ptime:20<br>
      a=maxptime:40<br>
      a=rtpmap:97 telephone-event/8000<br>
      <br>
      <br>
      &lt;--- Reliably Transmitting (NAT) to AL.AL.AL.AL:5060 ---&gt;<br>
      SIP/2.0 401 Unauthorized<br>
      Via: SIP/2.0/UDP
AL.AL.AL.AL:5060;branch=z9hG4bK5dee58e3294e4b7f9fe34c65af7b4cae;received=AL.AL.AL.AL<br>
      From: "Dan Luc"
<a class="moz-txt-link-rfc2396E" href="sip:328883300@AL.AL.AL.AL:5060;user=phone">&lt;sip:328883300@AL.AL.AL.AL:5060;user=phone&gt;</a>;tag=37a49f0486bab42b240be214b2d13153<br>
      To: <a class="moz-txt-link-rfc2396E" href="sip:311083335533@A1.A1.A1.A1;user=phone">&lt;sip:311083335533@A1.A1.A1.A1;user=phone&gt;</a>;tag=as1b6f387a<br>
      Call-ID: <a class="moz-txt-link-abbreviated" href="mailto:2fae0b0266919172cac1e23dc2567cd2@192.168.8.10">2fae0b0266919172cac1e23dc2567cd2@192.168.8.10</a><br>
      CSeq: 443337258 INVITE<br>
      Server: Asterisk PBX 1.6.2.20<br>
      Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE,
      NOTIFY, INFO<br>
      Supported: replaces, timer<br>
      WWW-Authenticate: Digest algorithm=MD5, realm="domain.tld",
      nonce="7684ab1d"<br>
      Content-Length: 0<br>
      <br>
      <br>
      &lt;--- SIP read from UDP:AL.AL.AL.AL:5060 ---&gt;<br>
      INVITE <a class="moz-txt-link-freetext" href="sip:311083335533@A1.A1.A1.A1;user=phone">sip:311083335533@A1.A1.A1.A1;user=phone</a> SIP/2.0<br>
      Allow: INVITE, ACK, CANCEL, BYE, PRACK, NOTIFY, SUBSCRIBE,
      OPTIONS, UPDATE<br>
      Supported: replaces, timer, 100rel<br>
      User-Agent: OmniPCX Enterprise R9.1 i1.605.21<br>
      Session-Expires: 1800;refresher=uac<br>
      Min-SE: 900<br>
      P-Asserted-Identity: "Dan Luc"
      <a class="moz-txt-link-rfc2396E" href="sip:328883300@192.168.8.10;user=phone">&lt;sip:328883300@192.168.8.10;user=phone&gt;</a><br>
      To: <a class="moz-txt-link-rfc2396E" href="sip:311083335533@A1.A1.A1.A1;user=phone">&lt;sip:311083335533@A1.A1.A1.A1;user=phone&gt;</a><br>
      From: "Dan Luc"
<a class="moz-txt-link-rfc2396E" href="sip:328883300@AL.AL.AL.AL:5060;user=phone">&lt;sip:328883300@AL.AL.AL.AL:5060;user=phone&gt;</a>;tag=37a49f0486bab42b240be214b2d13153<br>
      Contact: <a class="moz-txt-link-rfc2396E" href="sip:328883300@AL.AL.AL.AL:5060;transport=UDP">&lt;sip:328883300@AL.AL.AL.AL:5060;transport=UDP&gt;</a><br>
      Call-ID: <a class="moz-txt-link-abbreviated" href="mailto:2fae0b0266919172cac1e23dc2567cd2@192.168.8.10">2fae0b0266919172cac1e23dc2567cd2@192.168.8.10</a><br>
      CSeq: 443337259 INVITE<br>
      Max-Forwards: 70<br>
      Authorization: Digest
username="SIPPEERusername",realm="domain.tld",nonce="7684ab1d",algorithm=MD5,uri=<a class="moz-txt-link-rfc2396E" href="sip:311083335533@A1.A1.A1.A1;user=phone">"sip:311083335533@A1.A1.A1.A1;user=phone"</a>,response="38bb824b9081bf2eefe9f9677d3eb005"<br>
      Via: SIP/2.0/UDP
      AL.AL.AL.AL:5060;branch=z9hG4bK52dae2e7816406e20a9c02aa9cb86726<br>
      Content-Type: application/sdp<br>
      Content-Length: 292<br>
      <br>
      v=0<br>
      o=OXE 1322045354 1322045354 IN IP4 AL.AL.AL.AL<br>
      s=abs<br>
      c=IN IP4 AL.AL.AL.AL<br>
      t=0 0<br>
      m=audio 34422 RTP/AVP 8 18 97<br>
      a=sendrecv<br>
      a=rtpmap:8 PCMA/8000<br>
      a=ptime:20<br>
      a=maxptime:30<br>
      a=rtpmap:18 G729/8000<br>
      a=fmtp:18 annexb=no<br>
      a=ptime:20<br>
      a=maxptime:40<br>
      a=rtpmap:97 telephone-event/8000<br>
      <br>
      <br>
      &lt;--- Transmitting (NAT) to AL.AL.AL.AL:5060 ---&gt;<br>
      SIP/2.0 100 Trying<br>
      Via: SIP/2.0/UDP
AL.AL.AL.AL:5060;branch=z9hG4bK52dae2e7816406e20a9c02aa9cb86726;received=AL.AL.AL.AL<br>
      From: "Dan Luc"
<a class="moz-txt-link-rfc2396E" href="sip:328883300@AL.AL.AL.AL:5060;user=phone">&lt;sip:328883300@AL.AL.AL.AL:5060;user=phone&gt;</a>;tag=37a49f0486bab42b240be214b2d13153<br>
      To: <a class="moz-txt-link-rfc2396E" href="sip:311083335533@A1.A1.A1.A1;user=phone">&lt;sip:311083335533@A1.A1.A1.A1;user=phone&gt;</a><br>
      Call-ID: <a class="moz-txt-link-abbreviated" href="mailto:2fae0b0266919172cac1e23dc2567cd2@192.168.8.10">2fae0b0266919172cac1e23dc2567cd2@192.168.8.10</a><br>
      CSeq: 443337259 INVITE<br>
      Server: Asterisk PBX 1.6.2.20<br>
      Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE,
      NOTIFY, INFO<br>
      Supported: replaces, timer<br>
      Session-Expires: 1800;refresher=uac<br>
      Contact: <a class="moz-txt-link-rfc2396E" href="sip:311083335533@A1.A1.A1.A1">&lt;sip:311083335533@A1.A1.A1.A1&gt;</a><br>
      Content-Length: 0</font><br>
    <br>
    <br>
    Thanks !<br>
    <br>
    Jonas.<br>
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