Why IMS?

• IP Multimedia Subsystem (IMS) is a standardized architectural framework

• IMS was originally designed by the wireless standards body 3rd Generation Partnership Project (3GPP)

• IMS is not intended to standardize applications, but rather to aid the access of multimedia and voice applications from wireless and wireline terminals, i.e., to create a form of fixed-mobile convergence (FMC)

• global standards based on IMS are MMTel which is the basis for Voice over LTE (VoLTE) and Wi-Fi Calling (VoWiFi)

• IMS is lauded for its openness and well-defined hierarchical structure

• The biggest challenge for any telecom service provider is to operate their network at the lowest unit cost structure and open for new revenue sources and the IP multimedia subsystems help to overcome this challenge successfully

Technical features of the Cirpack IMS solution:

• Scalability: fully virtualized and modular add-on modules can be easily added to provide a scalable network from 10,000 subscribers to several millions of subscribers

• Redundancy: geo-redundant clusters in active standby; fully automatic takeover in case of application server failure

• Total openness: all interfaces are IMS compliant to interoperate with third party 3GPP TS 24 229 compliant equipment

• Security: authentication with http digest or IMS AKA

• User identities: public and private identities; implicit registration; wildcard PBX

• Subscriber provisioning: a a full-featured REST API enables complete provisioning flexibility without restrictions

• Billing: classic CDR as well as Rf are generated; Ro-Diameter interfaces are available

• All legal and regulatory requirements are fully implemented

• Standards: based on 3GPP TS 24.229