Eventide NexLog 4000 — High-Density Voice Recorder for Public Safety Dispatch Centers

The Eventide NexLog 4000 is the reference voice recorder for large public safety dispatch centers — 9-1-1 emergency services systems, national police command centers, and fire department communications systems — that must simultaneously record thousands of radio, telephony, and VoIP channels with legal evidence guarantee. The density of 4,000 channels in a standard 2U rack chassis is the highest available in the mission-critical recorder market.

Each NexLog 4000 recording carries a digital chain of custody with SHA-256 hash calculated at capture time and immutable: any subsequent modification of the audio file produces a different hash that the system detects and reports as tampering.

The NexLog 4000 multi-channel incident player allows investigators and quality reviewers to play all channels involved in an incident — terrestrial radio, cellular, P25 radio, VoIP — synchronized on a single timeline, with GPS position maps synchronized when recordings include location metadata.