Another thing worth paying attention to is the CSipSimple project . It uses pjsua as a SIP library. Video call developed in the thread.
I have not tested it yet, but it seems to work according to the problem. The question starts out more interesting from comment 27 , because after that the video replacements seem to work.
Check it out and learn it. It will probably take some time to first find a path around the code.
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