[OpenSIPS-Users] how to send a 'list' parameter to rtpengine, or modify SDP in script before sending to rtpengine

[Răzvan Crainea]

Hi, Jeff!

Indeed, this is not yet supported in OpenSIPS. Can you please open a 
feature/change request[1], so I can keep track of this limitation?

[1] https://github.com/OpenSIPS/opensips/issues

Best regards,

Răzvan Crainea
OpenSIPS Core Developer / SIPhub CTO
http://www.opensips-solutions.com / https://www.siphub.com

On 2/19/25 11:31 PM, Pyle, Jeff wrote:
> I asked the rtpengine-related part of this question on the rtpengine 
> list. Richard's response:
> 
>     In the newer Kamailio module we have restructured the flags parsing
>     so that you can do `rtpengine_offer("sdp-media-remove=[video message
>     image]")` but likely that change hasn't made it over to OpenSIPS yet.
> 
> 
> Is his assumption correct? Does this make sense for a feature request on 
> the Github page?
> 
> 
> Regards,
> Jeff
> 
> 
> 
> ------------------------------------------------------------------------
> *From:* Users <users-bounces at lists.opensips.org> on behalf of Pyle, Jeff 
> <JPyle at fusionconnect.com>
> *Sent:* Wednesday, January 22, 2025 18:30
> *To:* OpenSIPS Users <users at lists.opensips.org>
> *Subject:* [OpenSIPS-Users] how to send a 'list' parameter to rtpengine, 
> or modify SDP in script before sending to rtpengine
> Hello,
> 
> I'm on OpenSIPS 3.4.9 with rtpengine 13.1.1.6. I'm trying to make use of 
> the 'sdp-media-remove' command supported in this version of rtpengine to 
> remove unwanted media sessions from the SDP.
> 
> The author of rtpengine reminds me its syntax is
>    "sdp-media-remove" : ["<media-type>", "<media-type>", ...]
> 
> Or, in other words, this command requires a 'list' as its parameters.
> 
> The only way I could get rtpengine not to throw an error was by using 
> "sdp-media-remove=video". rtpengine shows this as
>    "sdp-media-remove": "video"
> 
> Based on the documentation, it needs to be
>    "sdp-media-remove" : ["video"]
> 
> How can one formulate an rtpengine_offer() command so that I can provide 
> a 'list'. In my case I want to preserve only the 'audio' session, so, I 
> need to write an rtpengine_offer() message with the sdp-media-remove 
> command that sends this:
>    "sdp-media-remove" : ["video", "text", "application", "message", "other"]
> 
> Even better, is it possible to use standard OpenSIPS scripting commands 
> like stream_exists() and stream_delete() to remove the streams from the 
> SDP before sending to rtpengine? In my testing, these commands don't 
> have any effect on what rtpengine receives.
> 
> I have Cisco devices on my network that send an rtpmap payload of 255, 
> which rtpengine typically refuses to process because it's out of spec. 
> Removing the erroneous an unnecessary streams in OpenSIPS before 
> processing in rtpengine would solve this problem without having to patch 
> rtpengine.
> 
> 
> Regards,
> Jeff
> 
> 
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> 
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