I have a Grandstream GDS3710 video doorbell and a GS3510 video intercom connected to FreePBX through pjsip, and when the GDS3710 calls directly the GS3510 to it’s IP there is a preview of the video on the screen before answering but through FreePBX it is not working.
I tried the solution by @danielf below but unfortunately without success:
I’m getting the added header in the logs, but I don’t know if it is because the URL of the streams seems to have changed, there’s only an RTSP stream I tried with it but without success.
I’ve seen there may be something to configure with pjsip to allow the preview video but I didn’t find exactly what to do.
I’ve tried a couple of things without success, is there any way to see what could be missing during the call to make this work?
Does someone have a solution to this problem?