Texas Utilities Code - UTIL § 55.126. Device Disconnection

A person may not use an automated dial announcing device to make a telephone call in which the device plays a recorded message when the connection is completed unless the device disconnects from the called person's line not later than five seconds after the call is terminated by either party. If the device cannot disconnect during that period, a live operator must introduce the call and receive the called person's oral consent before beginning a prerecorded or synthesized voice message.