Have just shifted back to Telecom broadband from TCL and have a monitored alarm. The alarm has a filter installed so I thought a splitter wasn't needed.

Turns out alarm would not call out while broadband was connected but worked fine when I unplugged broadband. I saw that previous comments on this topic have recommended the installation of a house splitter which I had installed this morning.

Now the alarm still does not call out and when previously I could unplug broadband, I can't unplug the splitter.

I can only conclude that maybe the filter on the alarm is causing the issue or there are some other settings that need to be adjusted. The alarm can access the phone line as I can hear it trying to dial out when I'm on the line, it seems it just cannot connect to base.

Any ideas welcome.