By Arun Handa
The IP Multimedia Subsystem (IMS) is the root structure for the subsequent iteration of cell phones, wireless-enabled PDAs, desktops, etc, supplying multimedia content material (audio, video, textual content, etc.) over every kind of networks. it really is crucial for community engineers/administrators and telecommunications engineers not to in basic terms comprehend IMS structure yet to even be in a position to follow it at each level of the community layout approach. This publication will comprise pragmatic info on how you can engineer IMS networks in addition to an functions orientated strategy, for engineering and networking pros who're chargeable for making IMS "play" within the genuine global. * Describes the convergence of instant IMS (IP Multimedia Subsystem) with different networks, together with wireline and cable * Discusses development interfaces for finish clients and IMS functions servers * Explores community administration concerns with IMS
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Additional info for System Engineering for IMS Networks
Wireless services are about the subscriber and not about devices. The subscriber identity is stored in the Subscriber Identity Module (SIM). This is hosted on a small chip that can be used interchangeably within different cellular devices in GSM/UMTS networks. In CDMA/ ANSI networks, this is integrated within the phone. Subscriber identity in wireless networks has traditionally been used as a 10-digit number. This unique number is the public identity of the subscriber, which as we know is required to make or receive calls.
To achieve mobility, we define a home network, where the user is provisioned. In this network, the HLR stores all the subscription-related information. The subscriber normally registers and obtains service within this home network. When the subscriber moves out of the home network and requests service of a different network, it is referred to as the visited network. The visited network has to have a roaming agreement with the home network, to be able to determine whether to provide service to this visitor.
All three protocols have the capability to multiplex on the ports. The transport protocols have an inherent capability for checksums, which allow detecting corrupted packets. TCP and SCTP extend additional reliability by retransmission of lost packets and by providing congestion avoidance mechanisms. SCTP offers built-in heartbeats, better flow control, and multi-homing capabilities for more reliability. 2 Session Protocols A call is the familiar unit of voice communications. Similarly, a session is the unit of multimedia communications.