Need help setting up linphone

Hi, I am trying to set up linphone in a debian appVM (R4.2). The idea is to run the appVM behind my vpnVM (using wireguard) which is connected to my router. This router allows the use of of linephone. I partly succeeded in setting up the system. But only partly. I can sometimes recieve and make calls and other times I do not get through. It is probably related to port forwarding but I have not found a proper solution in the forum. And currently I am very limited with my time to play with the system a whole lot to figure it out myself.
Can anyone help me who already succeeded in setting it up?

Best regards

If you search this forum for “port forwarding” you’ll fine a post by @solene linking to a script she hosts externally: here.
I have never set up linphone so I have no idea what ports are actually needed (h323 + signalling?).

Hi, thank you for the link. It seems as if linphone is a little buggy in general. hopefully I can get it to work in the next few days.