{
  "node_id": "3gpp-ims-ip-multimedia-subsystem-release-16",
  "title": "3GPP IMS IP Multimedia Subsystem Release 16 - SIP Signalling, P-CSCF Security and Emergency Call Procedures",
  "domain": "Telecoms & Digital Infrastructure",
  "version": "1.0.0",
  "last_updated": "2026-04-18",
  "bluf": "This standard mandates that telecommunications operators implementing IP Multimedia Subsystem (IMS) Release 16 must establish secure signalling interfaces using IPsec or TLS between the User Equipment (UE) and the P-CSCF, and between network nodes, to ensure confidentiality and integrity for all SIP communications, as specified in 3GPP TS 33.203.",
  "paywall": {
    "status": "LOCKED",
    "unlock_cost_usd": "0.01",
    "skyfire_id": "41779894-ece2-4163-9761-b3b1b76e19b0"
  },
  "crosswalks": {
    "_available_keys": [
      "nist_framework",
      "iso_standard",
      "industry_mapping",
      "ai_overlay_2026"
    ],
    "_note": "Full crosswalk values included in vault response"
  },
  "dependencies": [
    "nist-sp-800-131a-rev-2-crypto-transitions",
    "nist-sp-800-57-key-management"
  ],
  "primary_citations_count": 7
}