REDCOM Sigma Client
Secure C2 comms app for Windows, ATAK, & Android
Product Overview
REDCOM Sigma® Client is a C2 softphone with robust voice, video, and chat support. When coupled with the REDCOM Sigma® C2 Software platform, the REDCOM Sigma Client delivers instantaneous communications to users at the tactical edge. The REDCOM Sigma Client is available on Windows, ATAK, and Android platforms.
Sigma Client Key Benefits
- Provides warfighters with interoperable PTT comms from any smartphone, PC, or ATAK device
- Reduces the amount of equipment each soldier must carry
- Enables a true all-in-one C2 common operating picture
- Intuitive interface is easy-to-use and optimized for chaotic environments
See Sigma Client in action
Get a closer look at how Sigma Client supports operators across Windows and ATAK environments. From the redesigned Windows grid UI to ATAK-integrated push-to-talk, these videos show how Sigma Client brings voice, video, chat, and channel control into the operator’s workflow.
Dominate the net with communication channels
Sigma Client for ATAK and Windows lets operators spin up talk groups quickly, using both ad hoc and preconfigured channels to get teams coordinated before and during any mission.
- Ad-hoc channels: establish point-to-point communications with any Sigma-reachable endpoint
- Preconfigured channels: communicate with any combination of endpoints (other Sigma Client users, traditional and MANET radio nets, and telephone/softphone users) in a single voice channel.
- Monitor and communicate across multiple channels simultaneously
- UI is optimized for situational awareness. Active members are indicated with a checkmark and channels turn green to show the active speaker.
- A color indicator to the left of each channel identifies its security level.
- Spatial audio: deconflict multiple voice convesations by assigning channels to different positions on a headset (left front, left rear, right front, or right rear)
A more intuitive way to manage tactical comms
The redesigned Windows grid user interface gives operators a more detailed view of every assigned channel. Instead of relying on a simple channel list, users can see real-time channel state, active talkers, security classification, priority members, spatial audio position, and connected radio status directly inside each channel widget.
For operators managing multiple nets, the grid view helps reduce screen switching and keeps critical voice controls visible at all times.
Field-proven chat built for the fight
Sigma Client includes a unified chat via XMPP and IRC protocols, meaning users no longer require multiple chat clients, cutting down on the number of devices and applications a user needs to keep track of.
- Send images and attachments, reducing the need for email.
- Urgent message tags help users identify critical information.
- Windows users can resize and rearrange chat panels.
Persistent Push-to-Talk communications
REDCOM Sigma is a complete software-based Command & Control platform with voice, video, and chat. Sigma® XRI adds interoperability across radio nets. The REDCOM Sigma Client extends Sigma’s powerful interoperability to Windows, Android, and ATAK devices, enabling them to instantly communicate via PTT with any user or device on the tactical network.
- Converges half-duplex and full-duplex comms platforms
- Optimized for half-duplex communications common at lower tactical echelons
- Integrated with tactical PTT and headset hardware
- Embedded soft PTT button on screen for instant communications
Unleash ISR dominance through live video streaming
Sigma Client delivers warfighters real-time visual intelligence by enabling live video streaming directly from the field. Users can broadcast their device’s camera, push video feeds from external sensors or drones, and instantly switch between active streams — all within the Windows or ATAK app. With Sigma Client, teams gain immediate situational awareness and faster decision-making through seamless, resilient ISR video delivery.
- Stream your device's camera feed to a channel
- Stream RTSP video from an external camera or drone to a channel
- Select which video stream you want to watch directly in Sigma Client
Fortify your critical communications
Protect critical communications by taking advantage of Sigma Client’s powerful 2048-bit RSA encryption for voice, video, and chat.
- Call encryption (TLS/SRTP)
- Mutual authentication
- True dual registration to two independent SIP servers
- FIPS 140-3 validated encryption (Sigma v4.4 & higher)
