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27-09-2017, 10:46 PM

Hi am RKi would like to get details on ip multimedia subsystem testing interview questions

jaseela123d · 28-09-2017, 09:30 AM

The IP Multimedia Subsystem or the IP Multimedia Core Network Subsystem (IMS) is an architectural framework for the provision of IP multimedia services. Historically, mobile phones have provided voice call services over a circuit-switched style network, rather than strictly over a packet-switched IP network. Alternative methods of voice delivery (VoIP) or other multimedia services are available on smartphones, but have not been standardized across the industry. IMS is an architectural framework to provide this standardisation.

IMS was originally designed by the 3GPP (3rd Generation Partnership Project) as part of the vision for the evolution of mobile networks beyond GSM. Its original formulation (3GPP Rel-5) represented an approach to the delivery of "Internet services" over GPRS. This view was later updated by 3GPP, 3GPP2 and ETSI TISPAN by requiring support of networks other than GPRS, such as Wireless LAN, CDMA2000 and fixed lines.

To facilitate Internet integration, IMS uses IETF protocols whenever possible, for example, Session Initiation Protocol (SIP). According to 3GPP, IMS does not aim to standardize applications, but rather to help access multimedia and voice applications from wireless and cable terminals, that is, to create a form of fixed-mobile convergence (FMC). This is done by a horizontal control layer that isolates the access network from the service layer. From a logical architecture perspective, services do not need to have their own control functions, since the control layer is a common horizontal layer. However, in implementation this does not necessarily correlate with a greater reduction of costs and complexity.

Alternative and overlapping technologies for accessing and provisioning services over wired and wireless networks include combinations of Generic Access Network, Soft Switches and "naked" SIP. As content and contacts become increasingly easier to access using mechanisms beyond the control of traditional wireless / fixed operators, the interest of IMS is questioned. Examples of global standards based on IMS are MMTel, which is the basis for Voice over LTE (VoLTE) and Rich Communication Services (RCS), which is also known as joyn or Advanced Messaging.

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