About 3 or 4 months ago I switched to a new internet provider whom also sent me a new modem. Problem is, is that this new modem prevents my burglar alarm's dial out alert system from contacting my nominated phone numbers during an activation/test. If I turn off the modem there is no problem, the alarm works perfectly. This would be fine except that my brother in law lives next door and uses my internet connection so it is inconvenient if I'm away and have to switch the modem off to have the alarm fully functional. Prior to the provider change over I was using a 3rd party TP-Link TD-W8951ND modem with my prior service provider. This modem caused no problems at all with the function of the burglar alarm when left on. Therefore, I would like to use the TP-Link modem again but I can't get it to work on the new service. From memory, the modem that was supplied by the new provider was basically 'plug and play' and all I did was just cable it in and there was no keyboard work required. This is why I don't know why the TP modem doesn't work since I didn't change anything. Evidently, there are some configurations that do need altering but I haven't got a clue. Any help or ideas? Tom.