Hello everybody, I'm Christian a French telecom Engineer
I don't remember why I've signed up a long time ago here, the moderator just agree now.
Oh yes maybe it's because I'm looking for the wall mounted PPT24 internal pinout
this model: https://photos.app.goo.gl/zSbj82snxRQ8NGvTA
it don't pulse for outgoing call.
Also I'm an old experimented telecom expert and also expert on new tech, if you need any help you'r welcome.
That model is listed on eBay France fairly regularly so you may have luck by adding 'téléphone ancien' to your eBay.fr saved searches.
Normally the wiring of the desk and wall model is not too different.
Here are some diagrams for PTT 24 models:
http://alain.levasseur.pagesperso-orange.fr/ (http://alain.levasseur.pagesperso-orange.fr/) look for "Les 1924" in the menu