Overview#
When a call becomes the subject of a complaint, a court case, or an internal review, the recording needs to be exactly what was said, exactly when it was said, with an unbroken chain of custody from capture to playback. A recording that can't be verified is no better than no recording at all. The PSAP Recording & Playback module is built around that standard.
The module provides comprehensive evidence management for emergency call recordings, covering multi-format audio capture, synchronised screen recording, secure storage with tamper detection, chain-of-custody tracking, court-ready exports, and CJIS-compliant access controls for PSAPs, emergency communications centres, and police dispatch operations.
Key Features#
Multi-Channel Call Recording#
- Format: 16-bit PCM, 8 kHz minimum (telephony quality)
- Enhanced: 24-bit, 48 kHz for high-fidelity VoIP and NG911 / NG112 calls
- Codec options: G.711, G.722, Opus depending on call type
- Optional noise reduction pre-processing to improve playback clarity
Synchronised Screen Capture#
- Full-screen or application-specific recording
- Multi-monitor support capturing all screens simultaneously (up to 6 monitors)
- 30 FPS standard frame rate, 60 FPS available for training analysis
- Native resolution up to 4K (3840x2160)
Instant Playback & Search#
- Real-time transcription during recording with 96%+ accuracy on emergency vocabulary
- Keyword library with 500+ emergency terms indexed (weapons, medical, fire)
- Phrase search supporting multi-word queries ("not breathing", "chest pain")
- Synchronised timeline aligning audio, screen recording, and CAD entries
Quality Assurance & Scoring#
Automated scoring against configurable criteria:
- Answer time: whether the call was answered within target
- Greeting: correct protocol greeting used
- Voice quality: clear, calm, professional tone
- Active listening: appropriate responses and minimal interruptions
Evidence Management#
- Chain of Custody: Cryptographic signatures track every access event
- CJIS Compliance: FBI Criminal Justice Information Services standards enforced throughout
- Court Export: Format conversion for legal playback systems with bundled CAD report
- Redaction: PII removal while maintaining evidentiary value
- Tamper Detection: Write-once storage prevents modification after capture
- Audit Trails: Complete logs of who accessed recordings and when
CAD System Integration#
Recordings automatically link to CAD incidents:
- Recording IDs embedded in CAD incident records
- One-click playback from the incident screen
- Synchronised timeline matching CAD entries to recording timestamps
- CAD report and recording exported together for court bundles
Use Cases#
- Emergency dispatch centres maintaining CJIS-compliant recording for all 911 / 112 calls
- Multi-agency coordination centres archiving shared incident recordings across agency boundaries
- Quality assurance programs using automated scoring and targeted supervisor review
- Compliance teams preparing documentation for NENA and APCO accreditation reviews
- Legal teams producing court-ready evidence packages with verified chain of custody
- Training programmes extracting de-identified call clips for dispatcher skill development
Integration#
- CAD systems for incident linking and synchronised timeline export
- Telephony infrastructure for dual-channel audio capture
- Evidence management systems with cryptographic chain-of-custody tracking
- CJIS-compliant storage with write-once tamper protection
- Court export systems for legal playback format conversion
- Quality assurance and scoring platforms for automated evaluation
- Training platforms for clip extraction and learning content development
Open Standards#
- IETF RFC 7865 / RFC 7866 (SIPREC): The module implements the Session Recording Protocol as a Session Recording Server (SRS), accepting SIPREC INVITE requests with RFC 7865 recording metadata XML and ingesting media segments per the RFC 7866 SRS/SRC architecture.
- IETF RFC 6873 (SIPREC Metadata Extensions): Recording session metadata is parsed under the
urn:ietf:params:xml:ns:recording:metadatanamespace defined by RFC 6873, capturing delivery, encryption, and retention annotations from heterogeneous SBC vendors. - IETF RFC 3550 (RTP): Each ingested media segment carries an RTP SSRC identifier per RFC 3550, and the media pipeline handles standard RTP payload types including PCMU (G.711 µ-law), PCMA (G.711 A-law), and Opus.
- NENA-STA-010.3 (i3 NG911 Standard): All recording sessions are logged through the NG911 i3 audit action framework; replay access control and chain-of-custody entries conform to the i3 security and logging requirements for NG911 / NG112 PSAP environments.
- NENA-STA-012 (EIDO): Recordings are automatically linked to CAD incidents via the NENA Emergency Incident Data Object schema, enabling one-click playback from incident screens and bundled court exports that pair the EIDO incident record with its recording.
- FBI CJIS Security Policy: Access controls, audit logging, and storage are validated against CJIS Security Policy requirements, with RBAC restricted to cleared PSAP roles (Dispatcher, Supervisor, PSAP Admin) and every replay issuance written to an immutable audit trail.
- FIPS 180-4 (SHA-256): Each media segment is hashed with SHA-256 at ingest and again at sealing to produce a tamper-evident content digest; seals are chained into a Merkle tree with stateless inclusion-proof verification to meet write-once evidentiary requirements.
- RFC 8032 (EdDSA / Ed25519): Short-lived replay tokens are signed with tenant-scoped Ed25519 keys using the EdDSA algorithm, ensuring that playback URLs cannot be forged or replayed beyond their 15-minute TTL.
Last Reviewed: 2026-01-09 Last Updated: 2026-01-09