Which statement about Call Service Connect on a Cisco Spark Hybrid deployment is true?

= Call Service Connect is a hybrid service that allows integration between Cisco Spark and Cisco Unified Communications Manager (CUCM). Call Service Connect enables the Cisco Spark app to be used as a softphone for voice and video calling, and to share an extension with the CUCM desk phone. Call Service Connect also provides a unified call history and caller ID across Cisco Spark and CUCM devices123

Call Service Connect requires media traversal capabilities and licenses to be installed on the Expressway-C and Expressway-E pair that connects the CUCM and the Cisco Collaboration Cloud. Call Service Connect also requires mutual TLS (mTLS) authentication between the Expressway-E and the cloud, and between the Expressway-C and the CUCM. Call Service Connect depends on Call Service Aware, which is another hybrid service that synchronizes the user and device information from the CUCM to the cloud. Call Service Aware must be deployed before Call Service Connect124

References := 1Cisco Spark Hybrid Services Data Sheet 2Cisco Spark Hybrid Services Deployment Guide 3Cisco Spark Hybrid Services At-a-Glance 4Deployment guide for Hybrid Calling for Webex Devices (Device Connector)