https://www.cisco.com/c/en/us/support/docs/contact-center/unified-contact-center-enterprise/220123-configure-secure-rtp-in-contact-center-e.html
Configure Secure RTP in Contact Center Enterprise - Cisco
This document describes how to secure Real-time Transport Protocol (SRTP) Traffic in Contact Center Enterprise (CCE) comprehensive call flow.
secure rtpin contactconfigurecenterenterprise