PSAP Radio Dispatch Intelligence

Overview#

A major traffic collision closes the primary highway into a city. Three police units transmit simultaneously on Tac 4, fire sends a MAYDAY on the dispatch channel, and EMS is coordinating a trauma team. The dispatcher has four phone lines active and a CAD incident open. Without radio intelligence, those transmissions are background noise. With it, every radio exchange relevant to the active incident is transcribed, tagged, and correlated in real time alongside the telephony call, so the dispatcher misses nothing.

Radio Dispatch Intelligence centralises and makes searchable every radio transmission across all monitored talk groups, in real time. It supports P25 digital, DMR trunked, NXDN, TETRA, and analogue FM channels simultaneously. Transcription and keyword detection identify MAYDAY calls, critical condition reports, and unit location broadcasts the moment they occur, and a rules engine links radio transmissions to active call-for-service records and unit assignments. The result is that dispatchers and supervisors share a single, auditable record of what was said on the radio and what happened in response, rather than piecing it together from memory after the fact.

Key Features#

Multi-Protocol Talkgroup Monitoring: Simultaneously monitors P25 (Project 25 / APCO-25), DMR (Digital Mobile Radio), NXDN, TETRA, and analogue FM channels from a single integration point, so PSAPs with heterogeneous radio fleets do not need separate monitoring solutions for each protocol.
Real-Time Transcription with Keyword Detection: Every radio transmission is transcribed in real time using a speech engine tuned for public safety radio vocabulary. A configurable keyword and phrase library detects MAYDAY calls, officer-in-danger conditions, critical injury reports, and named location broadcasts the moment they appear in a transmission.
MAYDAY and Priority Transmission Alerting: Transmissions matching MAYDAY, emergency activation, or high-priority keywords immediately generate a visual and audible alert in the dispatcher console, so critical safety conditions are never buried in routine traffic.
Unit-to-Transmission Attribution: Transmissions are attributed to the originating unit identifier, whether a P25 radio ID, DMR subscriber ID, or TETRA ISSI, so every entry in the radio intelligence timeline shows which unit spoke and at what time.
Call-for-Service Linkage: Transmissions from units assigned to an active call-for-service are automatically correlated with the corresponding CAD incident, allowing dispatchers to see all radio traffic for an incident alongside telephony calls and CAD entries on a single unified timeline.
Talkgroup Classification and Prioritisation: Talk groups are classified by type, including dispatch, tactical, fire, EMS, police, interoperability, and administrative, and assigned operational priority levels so monitoring resources and alerting thresholds can be tailored per channel.
Carrier Frequency and NAC/Colour Code Configuration: P25 NAC (Network Access Code) and DMR Colour Code are configurable per talkgroup, enabling precise channel targeting in multi-site simulcast and trunked network environments.
Transmission Repository and Search: All transcribed transmissions are stored in a searchable, tenant-scoped repository indexed by talkgroup, time, unit ID, and keywords. Post-incident review, training, and quality assurance can find and replay any transmission without access to the raw radio recording.
Supervisor Radio Intelligence Dashboard: A supervisor-facing view aggregates current talkgroup activity, recent MAYDAY and priority alerts, active unit call assignments, and transmission counts per channel so the communications centre supervisor can monitor radio discipline across the entire fleet.
Radio Analytics for Training and Performance: Historical transmission data supports aggregate analytics including channel utilisation, MAYDAY frequency, average transmission duration, and unit response cadence, providing an evidence base for training programme development and channel optimisation.

Use Cases#

MAYDAY Detection During Firefighting Operations: A firefighter activates their emergency button on a P25 radio. The system detects the MAYDAY activation pattern, transcribes the transmission, and sends an immediate alert to the dispatcher console before the dispatcher hears the audio.
Multi-Unit Pursuit Coordination: Three police units transmitting rapidly on a tactical channel during a pursuit are each transcribed and attributed separately, so the dispatcher's unified timeline shows which unit reported the subject's location and direction at each step.
Post-Incident Reconstruction: After a major vehicle collision, the incident review team retrieves all radio transmissions from dispatch, tactical, and interoperability talkgroups for the ninety-minute period and replays them chronologically alongside CAD entries and telephony call records to reconstruct the full sequence.
Interoperability Channel Monitoring: During a joint fire and EMS response, separate organisations operating on an interoperability talkgroup have all transmissions captured and linked to the shared CAD incident so both communications centres see the complete picture.
Training Programme Development: A training coordinator identifies dispatcher radio phrasing errors and unit identification failures from the transmission repository and builds targeted radio discipline exercises from real examples.
Radio Discipline Quality Assurance: A supervisor analyses talkgroup utilisation data to identify channels with high transmission frequency but low unit attribution, indicating keying protocol violations or unauthorised transmissions.

Integration#

Radio Dispatch Intelligence integrates with CAD systems for call-for-service linkage, linking attributed transmissions to active incidents automatically as unit assignments change. It connects to the PSAP dispatcher console, surfacing real-time MAYDAY alerts and the radio intelligence timeline within the same operational workspace where telephony calls and incident management occur. Supervisor analytics feed the PSAP reporting and analytics system for historical trend analysis. The transmission repository exports to the recording and quality assurance system for formal call and radio review programmes. Radio source connectivity is achieved through SDR gateways, P25 conventional or trunked receivers, DMR repeaters, NXDN controllers, and TETRA infrastructure.

Open Standards#

APCO Project 25 (APCO-25 / P25, TIA-102 series): The radio monitoring service decodes P25 Phase I (FDMA) and Phase II (TDMA) digital radio frames using the TIA-102 series specifications, supporting conventional and trunked operation and parsing the P25 Network Access Code (NAC) and Radio ID from each transmission header.
ETSI TS 102 361 (DMR — Digital Mobile Radio): DMR Tier II and Tier III (trunked) transmissions are decoded according to the ETSI DMR specification series, using Colour Code and Subscriber/Group identifiers for talkgroup attribution and unit identification.
ETSI EN 300 392 (TETRA — Terrestrial Trunked Radio): TETRA voice group calls are monitored via the ETSI TETRA standard, with ISSI (Individual Short Subscriber Identity) and GSSI (Group Short Subscriber Identity) used for unit attribution and talkgroup correlation.
ITU-R M.1033 (Land Mobile Radio): Channel planning and interference management for analogue and digital talkgroup configuration follows the ITU-R M.1033 recommendations for land mobile radiocommunication systems, ensuring compliance with national spectrum allocation frameworks.
NENA i3 Standard (NENA-STA-010.3): Radio transmissions and MAYDAY alerts are logged through the NG9-1-1 i3 audit framework with typed action records so radio intelligence forms part of the same evidentiary record as telephony calls and CAD entries.
APCO ANS 3.103 (Radio Equipment Performance Objectives for Public Safety): Channel monitoring thresholds, MAYDAY detection latency requirements, and transmission quality standards are aligned with APCO 3.103 performance objectives for public safety radio equipment.
RFC 3550 (RTP — Real-Time Transport Protocol): Radio audio segments captured from IP-connected radio gateways are transported as RTP streams with standard RTP payload types for G.711 µ-law and G.711 A-law, and SSRC identifiers are used for per-transmission tracking within a talkgroup session.
NENA-STA-012 (Additional Data Repository): Transmission metadata including unit ID, talkgroup, frequency, protocol, and timestamp is structured using the NENA-STA-012 additional-data schema for radio sources, enabling NG9-1-1 systems to consume radio intelligence alongside telephony call data.
ISO 8601 / RFC 3339: All transmission timestamps, MAYDAY alert times, and talkgroup activity records use ISO 8601 date-time format with UTC offsets for unambiguous post-incident reconstruction across multi-agency environments with different timezone configurations.
JSON (RFC 8259): Transmission repository entries, talkgroup configuration, and analytics exports use JSON as the canonical interchange format, ensuring compatibility with CAD, recording, and analytics system integrations.

Last Reviewed: 2026-07-28 Last Updated: 2026-07-28