I should really get a new one to see if they've done anything about it. You need quite a modern chipset to make 4G calls. The new chipsets are cheaper than the old Qualcomm ones so they might end up making a VoLTE gate opener without even knowing about the issue!

kzfaq.info/get/bejne/e72TmcRm1sy3n6M.htmlsi=QJIMi-_35zy7kLCA Here is the link for the rtu5025. The 4g chip is shown as the guy disassembled the unit. Only thing he is speaking spanish.

​@@MIKE-il6muits a Quectel EC25 which is pretty much the same as the one in the unit I looked at. It has old 4G chips in it. They work on some networks but the IMS must be enabled as shown at the end of this video. Maybe the manufacturers know about it now or maybe they don't. You need to put the wires on to tell. If you have billing on your SIM card's network which shows whether the call was VoLTE or not that can also show if the IMS is enabled. The one I have it isn't. I did switch it on and it worked but I had to solder wires onto it and type the command in. The VoLTE system in North America is old so I reckon that would work there if it's enabled.

@@michaelbeaver8281 you may choose our WH-300 4G

Hi David, thank you for your interest in our intercoms. We don't currently sell any in the UK although Metalines and The Electric Gate Shop normally stock Priory Access intercoms. In a few months they will most likely have our latest intercoms.