<div dir="ltr"><div dir="ltr"><br>Hi, Răzvan.<br><br><div>The issue has been solved. I found needed script logic to get a string what I need.<br>Thanks a lot for pointing out direction to solve it.<div><br></div><div>Best Regards,</div><div>Sergey Pysanko.<br><br><br></div></div><br><div id="mt-signature">
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</td><td><span style="color:transparent;font-size:0">01/25/22, 02:01:06 PM</span></td>
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<br>
Rtpengine uses by default the SDP received in the message, it does not <br>
take into account any "local" changes you make.<br>
What you can try is to replace the body and get the result in a pvar, <br>
and then pass that pvar to the rtpengine_offer function[1], 3rd parameter.<br>
<br>
[1] <br>
<a href="https://opensips.org/html/docs/modules/3.2.x/rtpengine#func_rtpengine_offer" rel="noreferrer" target="_blank">https://opensips.org/html/docs/modules/3.2.x/rtpengine#func_rtpengine_offer</a><br>
<br>
Best regards,<br>
<br>
Răzvan Crainea<br>
OpenSIPS Core Developer<br>
<a href="http://www.opensips-solutions.com" rel="noreferrer" target="_blank">http://www.opensips-solutions.com</a><br>
<br>
On 1/18/22 19:37, Sergey Pisanko wrote:<br>
> <br>
> I tried to remove crypto strings that's not needed with "replace_body()" <br>
> function before rtpengine execution.. And I got the string what I need. <br>
> But despite this, when rtpengine is applied and proxy relays message to <br>
> UA2, rtpengine adds a string what I got rid from SDP on the previous <br>
> step. And I don't have any idea, from where rtpengine get crypto string <br>
> in a changed body. Here is what the script in this part looks like:<br>
> <br>
> branch_route[invite_to_pbx] {<br>
> xlog("outgoing to pbx");<br>
> if(has_body("application/sdp")) {<br>
> if (replace_body_all("a=crypto:([1-9])+( AES_CM_256)+(.*)$", <br>
> "")) {<br>
> xlog("Replaced");<br>
> }<br>
> rtpengine_offer("RTP/SAVP ICE=remove"));<br>
> }<br>
> }<br>
> <br>
> I also tried to execute this in a request route, but without changing.<br>
> <br>
> Can you help me to understand why rtpengine ignores changed SDP? Is my <br>
> script logic correct?<br>
> <br>
> Best regards,<br>
> Sergey Pysanko.<br>
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> 01/18/22, 07:13:23 PM <br>
> <br>
> <br>
> пт, 14 янв. 2022 г. в 17:30, Sergey Pisanko <<a href="mailto:serp87@yandex.ru" target="_blank">serp87@yandex.ru</a> <br>
> <mailto:<a href="mailto:serp87@yandex.ru" target="_blank">serp87@yandex.ru</a>>>:<br>
> <br>
> Hello.<br>
> <br>
> I've faced an issue when using rtpengine module with tls transport.<br>
> When UA originates a call it pointed set of crypto<br>
> parameters in SDP, like that:<br>
> <br>
> a=crypto:1 AES_CM_256_HMAC_SHA1_80<br>
> inline:PZASLY5HoxVo6Ljz2niwxqNJ+3A2mW71SgfL75cRFtShKQIvcKVF2Y39zGd1fQ==<br>
> a=crypto:2 AES_CM_256_HMAC_SHA1_32<br>
> inline:LRjGKIj8wvfxDP68+5XOEmlvO2ufqxDkhJ3hUQRWzjFulFr2kBztgSjrPSSACw==<br>
> a=crypto:3 AES_CM_128_HMAC_SHA1_80<br>
> inline:Nup7cVUaHGb+oQPf8gg1wDmjVJOZ5K+HZdhyovzz<br>
> a=crypto:4 AES_CM_128_HMAC_SHA1_32<br>
> inline:rjLdKaMyQ7+YQWCcIFKkVRLd+GZxkUogGK/4i1L0<br>
> <br>
> But when Opensips relays original message to UA2, rtpengine removes<br>
> all the crypto suite strings except the first one.<br>
> Unfortunately, there is no way to configure client's behaivior to<br>
> send certain crypto suite.<br>
> In other side, UA2, that is PBX, doesn't support all crypto suites<br>
> except AES_CM_128_HMAC_SHA1_80<br>
> Is there a way to configure Opensips/rtpengine to choose specific<br>
> crypto string or to leave crypto set without changing at all?<br>
> <br>
> Best Regards,<br>
> Sergey Pysanko.<br>
> <br>
> <br>
> <br>
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> 01/14/22, 05:28:49 PM <br>
> <br>
> <br>
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