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The IP Multimedia Subsystem or IP Multimedia Core Network Subsystem (IMS) is a standardised architectural framework for delivering IP multimedia services. Historically, mobile phones have provided voice call services over a circuit-switched-style network, rather than strictly over an IP packet-switched network.
Packet Data Protocol in wireless GPRS/HSDPA networks; Parallel distributed processing in connectionism; Plasma display panel; Policy Decision Point in the Common Open Policy Service; Portable DVD player; Power-delay product, the product of power consumption times the input–output delay; Power delay profile, signal intensity as a function of ...
For call setup, the body of a SIP message contains a Session Description Protocol (SDP) data unit, which specifies the media format, codec and media communication protocol. Voice and video media streams are typically carried between the terminals using the Real-time Transport Protocol (RTP) or Secure Real-time Transport Protocol (SRTP).
These two extensions allow users to specify their preferences about the service the IMS provides. With the caller preferences extension, [8] the calling party is able to indicate the kind of user agent they want to reach (e.g. whether it is fixed or mobile, a voicemail or a human, personal or for business, which services it is capable to provide, or which methods it supports) and how to search ...
PacketCable 1.0 comprises eleven specifications and six technical reports which define call signaling, quality of service (QoS), codec usage, client provisioning, billing event message collection, public switched telephone network (PSTN) interconnection, and security interfaces for implement a single-zone PacketCable solution for residential Internet Protocol (IP) voice services.
IMS (IP Multimedia Subsystem) is a set of specifications to offer multimedia services through IP protocol. This makes it possible to incorporate all kinds of services, such as voice, multimedia and data, on an accessible platform through any Internet connection (fixed or mobile).
The GGSN converts the GPRS packets coming from the SGSN into the appropriate packet data protocol (PDP) format (e.g., IP or X.25) and sends them out on the corresponding packet data network. In the other direction, PDP addresses of incoming data packets are converted to the GSM address of the destination user.
This is a list of the IP protocol numbers found in the field Protocol of the IPv4 header and the Next Header field of the IPv6 header. It is an identifier for the encapsulated protocol and determines the layout of the data that immediately follows the header. Both fields are eight bits wide.