name: IMS-ALG
full_form: IMS - Application Level Gateway
context: Figure 5.2.2.1.19.1.1 shows the session establishment with SDP offer/answer exchange from Originating side towards a Destination side, traversing an IMS Network Node including IMS-ALG function supporting OMR, and OMR results in IMS-ALG bypasses its local GW. Figure 5.2.2.1.19.1.-1: Message sequence chart for session establishment with IMS-ALG supporting OMR and IMS-ALG bypasses its local GW due to OMR process. 1. IMS-ALG receives an SIP INVITE with SDP offer-inc (call-ID#-inc) from Originating side, containing the transport address allocated in realm R1 by the Originating side for the media on incoming leg, and potential OMR information from prior user plane segments. 2. IMS-ALG determines the outgoing IP realm (R2) is different from the incoming IP realm (R1) and interacts with a GW in order to allocate a local transport address for the media on outgoing leg, in realm R2. 3. IMS-ALG generates SIP INVITE towards Destination side (call-ID#-out), with a new SDP offer-out including such
description: The IMS Application Level Gateway (IMS-ALG) manages session establishment, handles SDP offer/answer exchanges, and interacts with gateways to allocate transport addresses for media on incoming and outgoing calls within the IMS (IP Multimedia Subsystem) architecture.
explanation: The description emphasizes the IMS-ALG's functions like session management, address allocation, and interaction with other network elements. These activities are typical of a Network Function, which processes and controls network traffic and resources.
section_title: 5.2.2.1.19.1IMS-ALG related procedures for OMR â Session establishment and IMS-ALG bypasses its local GW
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biotag_Description: O,B-Network Function,I-Network Function,I-Network Function,I-Network Function,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network,O,O,O,O