A method of transmitting digital image signal data from a standalone device includes input image signals corresponding to views from outside the standalone device. Digital image signal data, corresponding to the input image signals, are output. The standalone device is permitted to connect to an internet-protocol network by setting an internet-protocol address for the standalone device itself. On the network, the digital image signal data is packetized and addressing of the packetized digital image signal data for the internet-protocol network is controlled, with a transport control protocol. The method includes self-initiating a connection with the network in response to a triggering signal on at least one alarm trigger input of a plurality of input/output terminals. An E-mail message is assembled including report information related to the triggering signal and digital image signal data corresponding to the views from outside the standalone device, and transmitted to an E-mail address via the transport control protocol and the internet-protocol network.