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

[Pyle, Jeff]

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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