[OpenSIPS-Users] Issue with rtpengine

[Sergey Pisanko]

Hi, Răzvan.

Thanks for your reply. According to your advice, I try to do something like
this:

$var(aline) = $(rb{sdp.line,a,9});
subst_body("/(a=crypto:1)+(.*)$/$var(aline)/" );

But I don't know, how to add changed SDP as a result of "subst_body"
execution into certain pvar. I could get only execution code, not an SDP.
If I add the string "rtpengine_offer("RTP/SAVP ICE=remove",
,"$var(body)");" next to the script above, I get a crypto string what I
need,
but everything else SDP strings takes from UA's original SDP (IPs, media
ports etc). What do I do wrong?

Best Regards,
Sergey Pysanko.



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01/21/22,
11:32:02 AM

ср, 19 янв. 2022 г. в 13:29, Răzvan Crainea <razvan at opensips.org>:

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