name: ESP
full_form: Encapsulating Security Payload
context: IPsec ESP as specified in reference RFC 4303 [54] shall provide integrity protection of SIP signalling between the UE and the P-CSCF, protecting all SIP signalling messages at the IP level. IPsec ESP general concepts on Security Policy management, Security Associations and IP traffic processing as described in reference RFC 4301 [53] shall also be considered. ESP integrity shall be applied between UE and P-CSCF either in transport mode if no NAT is present or â if NAT traversal shall be supported â in UDP encapsulated tunnel mode. ESP integrity can be provided by an integrity algorithm or an authenticated encryption algorithm, see IETF RFC 4106 [73]. The method to set up ESP security associations (SAs) during the SIP registration procedure is specified in clause 7. As a result of an authenticated registration procedure, two pairs of unidirectional SAs between the UE and the P-CSCF, all shared by TCP and UDP, shall be established in the P-CSCF and later in the UE. One SA pair is for
description: Encapsulating Security Payload (ESP) is a protocol that provides integrity protection of SIP signalling between the UE and the P-CSCF, protecting all SIP signalling messages at the IP level.
explanation: The text states that ESP is a "protocol" that provides security for SIP signaling. This clearly classifies it as a telecommunications protocol.
section_title: 6.3	Integrity mechanisms
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