What is a mobile telephony application server (mobile TAS) / MMTel-AS?
A mobile telephony application server (mobile TAS), sometimes known as an MMTel-AS, is a component used in the core network of a mobile network operator to provide telephony applications and additional multimedia functions to mobile devices.
A mobile TAS is typically deployed in mobile networks using 4G/LTE and IP Multimedia Subsystem (IMS) architectures, alongside components providing such as the Call Session Control Function (CSCF) and Home Subscriber Server (HSS).
A mobile TAS can serve multiple functions, including:
Some mobile TASs are purpose-built hardware appliances while some are virtualized network functions (VNFs) capable of running on general-purpose hardware or in a cloud environment as part of an NFV deployment.