name: SIP
full_form: Session Initiation Protocol
context: server within MC domain B. For SIP messages, the MC gateway server in MC domain A applies topology hiding by replacing the internal to/from SIP addresses (e.g. Public Service Identities) in the SIP header with the associated external SIP routing addresses and passes the SIP message to the MC gateway IS proxy. The IS proxy removes any internal SIP payload encryption, then based on the target MC domain (MC domain B) selects the appropriate inter-domain SPK to re-encrypt the SIP payload(s). The SIP message is then sent towards the MC gateway server in MC domain B over the SIP-3 interface where the MC gateway IS proxy in MC domain B receives the SIP message and decrypts it using the inter-domain SPK it has in common with MC domain A. The IS proxy in MC domain B may then re-encrypt the SIP payload(s) with an internal MC domain B SPK. The topology hiding function of the MC gateway server in MC domain B then replaces the external SIP routing addresses with internal SIP addresses applicable
description: Session Initiation Protocol (SIP) is a protocol used for initiating, maintaining, and terminating real-time communication sessions over IP networks. It is widely used in telecommunications for establishing voice, video, and messaging connections.
explanation: The text explicitly states that SIP is a protocol used for managing communication sessions.
section_title: 11.1.3	Interconnection security with MC gateway server
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biotag_Description: B-Protocol,I-Protocol,I-Protocol,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,O,O,O,O,O