name: NAT
full_form: Network Address Translation
context: It is assumed for the purposes of this annex that a NAT device may be located between the UE and the P-CSCF. Only NATs outside the borders of an IMS network are considered, i.e. NATs are assumed to be located at the subscriber's site or in the access network. If there are multiple NATs in either of these locations, it is assumed that their effect sums up in such a way that they can be treated as a single NAT so that the mechanisms described below are still valid. In this annex enhancements to sections 4 through 8 of this specification are specified that allow a UE and a P-CSCF to detect whether they are located behind a NAT device, to inform each other about their NAT traversal capabilities, and, if there is a NAT present, to securely communicate. If there is no NAT device present, the procedures of sections 6, 7 and 8 apply. Examples of subscribers who are, in general, located behind a NAT device include subscribers accessing IMS via a DSL line. Furthermore, this specification is
description: A Network Address Translation (NAT) device is a type of network hardware that enables multiple devices on a private network to share a single public IP address when accessing the internet or other external networks.
explanation: The context explicitly mentions NAT as a device located between the UE and the P-CSCF, highlighting its role in modifying network addresses for communication. This description aligns with the Device category.
section_title: M.1 	Scope
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biotag_Description: O,B-Device,I-Device,I-Device,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O