name: STN
full_form: Signalling Transport Network
context: In the flow figure 5.2.2.1.13.10-1, Call-ID #1 is for source access leg, Call-ID #1' for target access leg and Call-ID #2 for remote leg. Figure 5.2.2.1.13.10-1 Message sequence chart Inter-UE transfer triggered by target UE without collaborative session establishment The user is engaged in an active call session with UE#2 via either PS or CS access. UE#2 is having either PS or CS access (or both). 1. The user decides to transfer the session to UE#2, therefore initiates a call with UE#2 in its current (PS or CS) domain including the STN information to request the transfer of the session to UE#2. 2a. UE#2 originates a call in PS domain including the STN information to initiate Inter-UE transfer 2b. UE#2 originates a call in CS domain including the STN information (Inter-UE STN number) to initiate Inter-UE transfer. The ICS intermediate Nodes convert the request into IMS SIP format. 3. The request is forwarded to the S-CSCF. 4. The S-CSCF invokes the SCC Application as the first AS of
description: The Signalling Transport Network (STN) is a network responsible for transporting signalling messages between different network elements, enabling communication and session management in telecommunications.
explanation: STN is classified as a Network because its primary function is to facilitate the transmission of data essential for network operations and communication between various components within a telecommunications system.
section_title: 5.2.2.1.13.10Inter-UE transfer triggered by target UE without collaborative session establishment
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