name: ISDN
full_form: Integrated Services Digital Network
context: CC will be delivered as described in annex J. Exceptionally, SMS will be delivered via HI2. The transmission media used to support the HI3 port shall be standard ISDN calls, based on 64 kbit/s circuit switched bearer connections. The CC links are set up on demand to the LEMF. The LEMF constitutes an ISDN DSS1 user function, with an ISDN DSS1 basic or primary rate access. It may be locally connected to the target switching node, or it may be located somewhere in the target network or in another network, with or without a transit network in between. For network signalling, the standard ISDN user part shall be used. No modifications of the existing ISDN protocols shall be required. Any information needed for LI, like to enable correlation with the IRI records of a call, can be inserted in the existing messages and parameters, without the need to extend the ETSI standard protocols for the LI application. For each LI activation, a fixed LEMF address is assigned; this address is, within the
description: Integrated Services Digital Network (ISDN) is a digital telecommunications technology that enables the transmission of voice, video, and data over traditional copper telephone lines. It utilizes circuit-switched connections to provide reliable and dedicated communication channels for various services.
explanation: The text refers to ISDN as a technology that provides digital transmission and supports circuit-switched connections for voice, video, and data communications, clearly placing it within the realm of telecommunications technologies.
section_title: 5.3.1	CS-based Delivery of Content of Communication
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