# SI-04 (04) Inbound and Outbound Communications Traffic — NIST 800-53 Rev5 control

> FedRAMP Consolidated Rules for 2026 v2026.07.14.01 · updated 2026-07-14
> Canonical page: /control/si-4.4

Canonical id: `si-4.4` · family `SI`

> (a) Determine criteria for unusual or unauthorized activities or conditions for inbound and outbound communications traffic; (b) Monitor inbound and outbound communications traffic [organization-defined frequency] for [organization-defined unusual or unauthorized activities or conditions].

_Control title and statement: NIST SP 800-53 Rev5 catalog (the pinned commit is in `/api` under `control_text`). The FedRAMP rules reference these controls by id only; everything below is what FedRAMP says about this id._

## Rev5 baseline membership

- certification class C
- certification class D

## Key Security Indicators that reach it

- `KSI-MLA-LET` — Logging Event Types (Monitoring, Logging, and Auditing)
  A list of information resources and event types that will be logged, monitored, and audited is maintained and persistently reviewed to ensure these activities occur.
- `KSI-MLA-OSM` — Operating SIEM Capability (Monitoring, Logging, and Auditing)
  A Security Information and Event Management (SIEM) or similar system(s) is used and persistently reviewed for centralized, tamper-resistant logging of events, activities, and changes.
- `KSI-MLA-RVL` — Reviewing Logs (Monitoring, Logging, and Auditing)
  Logs are persistently reviewed and audited.

## FedRAMP guidance

{
  "guidance": [
    "Follow the FedRAMP Vulnerability Detection and Response and Vulnerability Evaluation and Reporting rules."
  ]
}