Hi - it's me again!  @Mikey_H

I noted in a thread on https://linustechtips.com/topic/1499641-cant-access-rtsp-streams-from-outside-network/:

"Actually it wasnt the cameras, it was the router it seems. For anyone reading this and having the same issue: turns out my router (TP-Link Archer C80) was messing with the RTSP traffic or at least that is what it seems. Went to the web gui -> Security -> ALG and turned off RTSP ALG. Problem solved. Thanks for your suggestion tho, doing a Wireguard tunnel is not a bad idea for privacy concerns. In my case its just a RTSP Stream aiming at the traffic light near my house so Im not that concerned about someone taking a look into it "

I noticed the Deco app does have SIP ALG - can we add other common Application Level Gateways - IPSec, RTSP, PPTP as well as SIP as available in other routers?