I’m working on a solution for my home door intercom. I would like to combine the RTSP video (from surveillance camera) with SIP audio (from intercom unit). I’m using this custom app (it needed a few bug fixes) here:
I didn’t need to use the SIP connection part of that app, it is meant for audio to the intercom but I have that working instead with the Page/ConfBridge.
I can successfully dial into the intercom and view the video from my video phone with this dialplan. This works great! 805 is the intercom.
[from-internal-custom]
; Doorbell video bridge
exten => doorbell_rtsp,1,Answer()
same => n,RTSP-SIP(rtsp://admin:12345@192.168.24.53:554/live/sub,0,asterisk,5060)
; Doorbell combined video/audio incoming
exten => 762,1,Answer()
same => n,Page(PJSIP/805&Local/doorbell_rtsp@from-internal-custom,qd)
Now I am trying to get the opposite to work where the intercom can dial the phone and the phone can watch the video. 701 is my phone.
[add-video]
exten => s,1,Set(PJSIP_MEDIA_OFFER(video)=h264)
same => n,Set(PJSIP_SEND_SESSION_REFRESH()=invite)
same => n,Return()
[from-internal-custom]
; Doorbell combined video/audio to 701
exten => 763,1,Answer()
same => n,Page(PJSIP/701&Local/doorbell_rtsp@from-internal-custom,qdB(add-video^s^1))
These are my three problems with this:
- The phone and RTSP-SIP aren’t offered the h264 codec so the video does not work
- The intercom will connect regardless of if the phone picks up
- The intercom won’t disconnect when the phone hangs up
I also tried playing around with ConfBridge and Originate and I couldn’t make it any better. Originate does not have any ability to offer video codecs.
I can probably figure out 2 & 3 but 1 I’m not sure. I’m guessing that unless the intercom actually connects with h264, the Page/ConfBridge will not offer it to the phone and RTSP-SIP.
Maybe I’m really close? Or maybe very far! 
Anyone have ideas? Thanks!