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IMS 
IP Multimedia Subsystem

IMS is defined by 3GPP/3GPP2 as a new core and service 'domain' that enables the convergence of data, speech and network technology over an IP-based infrastructure. It is the operator choice of control and service logic for primarily IP/packet-based person-to-person communication but also for person-to-content communication. 

For users, IMS-based services will enable communications in a variety of modes – including voice, text, pictures and video, or any combination of these – in a highly personalized and secure way.

IMS is designed to fill the gap between the existing traditional telecommunications technology and internet technology that increased bandwidth alone does not provide. This allows operators to offer new, innovative services that shareholders and end users are expecting.

White papers

Introduction to IMS
Services in the IMS ecosystem
Communication & information services for national security & public safety
Efficient softswitching
Evolution towards converged services and networks 

Technology descriptions

Virtually at home: High-performance access to personal media 

Multi-access for the IMS network 

Communication Services - The key to IMS service growth
Chat on phone, not a PC clone - IMS-based mobile community service
Service composition in IMS using Java EE SIP containers
Mobile services interworking for IMS and XML Web Services
Multimedia telephony for IMS - Interoperable VoIP with multimedia support
Realization and Performance Evaluation of IMS Multi-media Telephony for HSPA 
Ericsson IMS Client Platform
Sharing everyday experiences 
Ericsson's IMS solution for enterprise communication – The vehicle for collaboration 
Mobility World 

Ericsson solutions
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