I had a similar problem a while ago and i deal with it in my own way, which was quite simple actually.<div><br></div><div>1. First INVITE comes in, i check it does not has to_tag, i put its call-id in memcache and do normal processing.</div>
<div>2. For subsequent INVITE without to_tag, i check in memcache if call-id already exists, if yes then send stateless reply 100-Trying and exit. Otherwise treat it as first INVITE.</div><div>3. Memcache auto expires each record after 60 seconds, so we have auto clean up regardless if call was successful or failed.</div>
<div><br></div><div>If there is any better way, i would be happy to learn it.</div><div><br></div><div>Thank you.</div><div><br><br><div class="gmail_quote">On Thu, Aug 16, 2012 at 7:25 AM, Andrew Mason <span dir="ltr"><<a href="mailto:andrew.mason@voice.net.au" target="_blank">andrew.mason@voice.net.au</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi All,<br>
We recently encountered an issue in our datacenter where an upstream switch<br>
between the CPE and the OpenSIPS server was dropping packets. Obviously for<br>
VoIP this is not ideal but it did expose an issue in our configuration.<br>
<br>
If the packet dropped was a '183 Session Progress' or a 'Ringing' then the CPE<br>
would send the same Invite (exact same packet) to which our server issues a<br>
407 Proxy Auth Required. At which stage the CPE seems to hang up.<br>
<br>
My question: How can I determine if a call is already in progress for a<br>
particular Invite ?<br>
<br>
Apologies if my terminology is not correct, please let me know if anything<br>
does not make sense. I have inherited this system and am still very much<br>
learning about SIP and OpenSIPS.<br>
<br>
Thanks in advance<br>
Andrew<br>
<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br>Muhammad Shahzad<br>-----------------------------------<br>CISCO Rich Media Communication Specialist (CRMCS)<br>CISCO Certified Network Associate (CCNA)<br>Cell: +92 334 422 40 88<br>
MSN: <a href="mailto:shari_786pk@hotmail.com">shari_786pk@hotmail.com</a><br>Email: <a href="mailto:shaheryarkh@googlemail.com">shaheryarkh@googlemail.com</a><br>
</div>