Local Gateway enables the connection between Webex Calling and on-premises infrastructure or local PSTN providers - the solution is also known as Premises-based PSTN. In this lab, you will be introduced to a concept of Local Gateway with a focus on the Certificate-based trunking. You'll additionally gain knowledge on how to configure and verify this integration. This session is also valuable for CCIE collaboration lab exam preparation, as this topic is part of the exam blueprint.