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Hi Jason,
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<div class="">thank you for your answer. But could you please explain how the UE is identified?</div>
<div class="">Is it the contact header? Or some other stuff .. I wasn’t able to find any information.</div>
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<div class="">And yes, we plan to use the Rx as well. I am can make some traces and logs at Monday.</div>
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<div class="">Thank you</div>
<div class="">Fred</div>
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<div class="">Am 28.01.2016 um 20:49 schrieb Jason Penton <<a href="mailto:jason.penton@smilecoms.com" class="">jason.penton@smilecoms.com</a>>:</div>
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<div class="">Hi Fred,<br class="">
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I can answer the 1st question only as I am not too clued up with mediaproxy module and server.<br class="">
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The pcscf_is_registered function is used to confirm that the UE you are sending the request from is actually registered to the IMS. If this is true, then the P-CSCF will assert the identity and forward the request to I-CSCF or S-CSCF, depending on state and
request type. Normally the interface between UE and P-CSCF is via ipsec so it's almost a given that any traffic coming in on the ipsec pipe can be asserted. In the case without IPSEC however, there are various methods used to make sure the UE that is sending
the request is actually registered to the IMS. There are a few algorithms that can be configured to check - ie you can check the contact host and port (this is only works for invites as MESSAGEs don't have contact headers generally), then you can check the
received IP and port to make sure it's coming from a currently registered contact that used the same IP:PORT combination, etc, etc.<br class="">
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<div class="">Alternatively you could remove the check and pass the request onto the S-CSCF without asserting (not per std though) and then challenge all "cost incurring" requests with a 407 on the S-CSCF.... One limitatoin of not getting this working correctly
is that you will not be able to use the Rx interface unless you can match a contact on the P-CSCF (ims_qos module).... but perhaps you are not interested in Rx interface at the moment?<br class="">
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If you send me a trace (pcap) and logfile I'll take a look as soon as I get a chance and let you know what the problem is.<br class="">
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Cheers<br class="">
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Jason<br class="">
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<div class="gmail_quote">On Thu, Jan 28, 2016 at 9:24 PM, Fred Schulz <span dir="ltr" class="">
<<a href="mailto:FSchulz@blackned.de" target="_blank" class="">FSchulz@blackned.de</a>></span> wrote:<br class="">
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<div style="word-wrap:break-word" class="">Hi all,
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<div class="">we’re just playing around with an IMS setup bases on kamailio. Therefore the kamailio is used as P-,I- and S-CSCF.</div>
<div class="">We where able to register two clients through all components.</div>
<div class="">As we wan to start a call session, the P-CSCF answers with „403 - Forbidden. You must register with an S-CSCF“…</div>
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<div class="">I found this snippet in kamailio.cfg:</div>
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<div class=""><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;white-space:pre-wrap;background-color:rgb(255,255,255)" class="">if (!pcscf_is_registered(</span><span style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;white-space:pre-wrap;color:rgb(24,54,145)" class=""><span class="">"</span>location<span class="">"</span></span><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;white-space:pre-wrap;background-color:rgb(255,255,255)" class="">))
{ </span><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;white-space:pre-wrap" class=""></span><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;white-space:pre-wrap;background-color:rgb(255,255,255)" class="">send_reply(</span><span style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;white-space:pre-wrap;color:rgb(24,54,145)" class=""><span class="">"</span>403<span class="">"</span></span><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;white-space:pre-wrap;background-color:rgb(255,255,255)" class="">,</span><span style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;white-space:pre-wrap;color:rgb(24,54,145)" class=""><span class="">"</span>Forbidden
- You must register first with a S-CSCF<span class="">“</span></span><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;white-space:pre-wrap;background-color:rgb(255,255,255)" class="">)</span><span style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;white-space:pre-wrap;color:rgb(150,152,150)" class="">;
</span><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;white-space:pre-wrap" class=""></span><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;white-space:pre-wrap;background-color:rgb(255,255,255)" class="">break</span><span style="font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;white-space:pre-wrap;color:rgb(150,152,150)" class="">;
</span><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;white-space:pre-wrap;background-color:rgb(255,255,255)" class="">}
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<div class="">Can one tell me what exactly the kamailio is checking there? As I figured out it is looking in database location table.</div>
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<div class="">The table contains the registered users registered towards the IMS.</div>
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<div class="">Another „problem“ we faced with is the rtpproxy. As the <span style="color:rgb(51,51,51);font-family:Consolas,'Andale Mono WT','Andale Mono','Bitstream Vera Sans Mono','Nimbus Mono L',Monaco,'Courier New',monospace;font-size:14px;background-color:rgb(251,250,249)" class="">ngcp-mediaproxy-ng </span>is
no longer available and replaced with rtpproxy we’re trying to use it. But kamailio said that the proxy isn’t answering the way expected.</div>
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<div style="margin:0px;font-size:11px;line-height:normal;font-family:Menlo;color:rgb(195,55,32)" class="">
ERROR: rtpengine [rtpengine.c:1622]: rtpp_test(): proxy responded with invalid response</div>
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<div class="">Any advise would be nice.</div>
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<div class="">Thank you</div>
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<div class="">Fred</div>
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