A method for etching an insulating layer of an electronic or microelectronic component uses a catalyst that is present during the etching. In response to receiving the new message from a mobile switching center, the serving base station maintains resource allocations for the mobile station and notifies the mobile station of the holding call, causing a ring tone to sound at the mobile station. The video-audio capturing module is configured to capture an image and voice of a local user, and accordingly generates local video-audio data.