As above you will need a shock sensor that can supply cc circuits
ie
Knight Grade 2 Shock and Surface / Tilt Sensor [SEISMO] - £18.69 : | Best Price Promise | Security Warehouse Professional products
There are very few panels that small anymore.
Eaton is a popular choice with good integration options. HKC has better wireless infrastucture if thats needed.
You can usually change them yourself but it is usual the batteries are replaced every 2 years on the service. Care needs to be taken as you can easily damage them if opened incorrectly.
Also you may breach your service agreement
K band will penetrate less but will still penetrate. If not a conservatory abd you can place the detector away I'd suggest a quad. Maybe a photo of the area and a drawing showing location would help
You could use the pyronix stand alone reciever with pyronix peripherals. It will give hard wired connections. Alternatively upgrade and use a texecom ricochet expander
The handsets should call when pressing the call button.
Is the handset sitting correctly when on hook as it wont call when off hook.
also the unit may have a mute facility is this enabled?
From the sounds of it that sounds like some sort of kit. If its BNC at the DVR end id expect it to be the same camera end.
Do you have pictures of both ends of the cable to be sure?
The sd1 is a pstn based dialler.
Menvier SD1+ Speech Dialler [SD1-UK]
The sd3 is obsolete and was a gsm based unit. Yes the SD3 replacement is the Eaton Universal 4G speech dialler [SD-LTE]
Assuming a modern galaxy then
Honeywell Wireless Door/window compact magnetic contact Brown [DO800M2] - £44.98 : | Best Price Promise | Security Warehouse Professional products
Look slike a problem with circuit 1
Have you metered it is the contact closing as expected what is the resistance reading when the door is closed.
Why was the previous panel replaced but also bear in mind the g4 has been out of production for a while are you sure you have a brand new panel?