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Hello,<br>
<br>
On 12/12/11 12:02 PM, Phillman25 Kyriacou wrote:
<blockquote
cite="mid:CAEprJzLAUxpH8eS6i5xwHTHa0iPjiWYYpLwc0sV-m+Uv-9C2Yw@mail.gmail.com"
type="cite">Dear Daniel<br>
<br>
Thanks, this worked!<br>
I will inform my carrier that they are handling the ACK 200
message wrong.<br>
just one question: the syn_branch=0 is used for only stateless ACK
messages?<br>
</blockquote>
it is used for all stateless forwarded requests. By its nature, ACK
is always stateless because it does not take any reply, so there is
no dedicated transaction for it -- in other words, no matter how you
send the ACK from config (e.g., t_relay() or forward()), it will be
done stateless.<br>
<br>
Cheers,<br>
Daniel<br>
<br>
<blockquote
cite="mid:CAEprJzLAUxpH8eS6i5xwHTHa0iPjiWYYpLwc0sV-m+Uv-9C2Yw@mail.gmail.com"
type="cite"><br>
Thanks again for your assistance!<br>
Phillip<br>
<br>
<br>
<div class="gmail_quote">On Mon, Dec 12, 2011 at 11:25 AM,
Daniel-Constantin Mierla <span dir="ltr"><<a
moz-do-not-send="true" href="mailto:miconda@gmail.com">miconda@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> Hello,
<div class="im"><br>
<br>
<br>
On 12/12/11 8:18 AM, Phillman25 Kyriacou wrote:
<blockquote type="cite"><span style="color:rgb(0,0,0)">Dear
List</span><br style="color:rgb(0,0,0)">
<br style="color:rgb(0,0,0)">
<span style="color:rgb(0,0,0)">I'm currently facing an
issue with a carrier whereby they are complaining that
the via header branch parameter (sip.Via.branch == "</span><span
style="font-size:11pt;font-family:"Arial","sans-serif";color:rgb(0,51,255)"><span
style="color:rgb(0,0,0)">z9hG4bKcydzigwkX") in the
ACK messages is not unique which results in some
calls being successful and some terminating after 20
seconds as their sip proxy determines it as a
duplicate request. Is there a way to make the via
header branch parameter in the ACK message unique
across every transaction?<br>
</span></span></blockquote>
</div>
set in your config file the global parameter:<br>
<br>
syn_branch=0<br>
<br>
On the other hand, the behavior of the devises used by
carrier is completely broken. ACK can have a different path
than INVITE, so there should be no match done on Via branch
parameter. Since it is ACK for 200OK, it has to be matched
for dialog. Having the RFC3261 cookie in the branch
parameter, it has to be matched with (callid, from tag, to
tag).<br>
<br>
Cheers,<br>
Daniel<br>
<font color="#888888">
<pre cols="72">--
Daniel-Constantin Mierla -- <a moz-do-not-send="true" href="http://www.asipto.com" target="_blank">http://www.asipto.com</a>
<a moz-do-not-send="true" href="http://linkedin.com/in/miconda" target="_blank">http://linkedin.com/in/miconda</a> -- <a moz-do-not-send="true" href="http://twitter.com/miconda" target="_blank">http://twitter.com/miconda</a></pre>
</font></div>
</blockquote>
</div>
<br>
<br>
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</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla -- <a class="moz-txt-link-freetext" href="http://www.asipto.com">http://www.asipto.com</a>
<a class="moz-txt-link-freetext" href="http://linkedin.com/in/miconda">http://linkedin.com/in/miconda</a> -- <a class="moz-txt-link-freetext" href="http://twitter.com/miconda">http://twitter.com/miconda</a></pre>
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