What is IMS Core? Standards-based architecture for enabling the delivery of multimedia services such as voice calls, messaging, and file-sharing; consists of Human Subscriber Server (HSS) and Call Session Control Function (CSCF). Mavenir expertise has been instrumental in creating and implementing highly scalable and resilient IMS solutions in technologies commonly used in large scale Telco data centers. Our virtualized IMS solutions offer deployment flexibility to help meet a range of business needs, including multi-tenancy, and capacity elasticity.