DAMM TetraFlex® PTT App

DAMM PTT App for smart devices

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The DAMM TetraFlex PTT App is a smartphone application for  secure business critical communication - utilizing LTE or WiFi

The DAMM® PTT App is developed, owned and maintained by DAMM Cellular Systems. It is a vendor and technology independent soft terminal, tailored for secure and private communication. No radio gateways are required; the DAMM PTT App is a purely IP based solution that operates independent of any radio infrastructure.

The DAMM PTT App can be fully integrated into a DAMM system, and can thereby be used with all DAMM TetraFlex Gateways and applications, like the Voice and Data Log system or Dispatcher.

The DAMM PTT App includes features like:

  • Push-to-talk group-calls between other PTT apps, TETRA terminals and dispatchers
  • Push-to-talk to bridged PMR systems connected via DAMM TetraFlex Group Bridge
  • PTT-key on touch screen or via headset button
  • Individual simplex and duplex calls between other PTT apps, TETRA Terminals or dispatchers
  • Duplex calls to telephones connected via DAMM TetraFlex Voice Gateway
  • Optimized bandwidth consumption using ACELP/TETRA voice codec
  • Video Streaming to other PTT apps or DAMM Dispatchers
  • SDS text messaging between PTT apps, Tetra terminals, dispatchers and other compatible devices
  • Image transfer to and from other soft terminals and DAMM Dispatchers


The DAMM PTT App registers itself via any IP network, such as Wi-Fi or 3/4G networks, 
to the DAMM TetraFlex Terminal Gateway.

Voice communication 
The DAMM PTT App makes it possible to listen to and talk in group calls, as well initiate or receive full individual duplex calls. Up to 7 different talkgroups may be scanned simultaneously, and it is possible listen to two audio streams at the same time.

Individual calls can be established by typing the user number, ISSI or unified number of the called party. The phonebook updates directly from the subscriber register. 

Group calls can be muted/unmuted at any time and priority can be set between individual and group calls.

DAMM PTT App

SDS and positioning 
With the DAMM PTT App, it’s possible to send and receive secured SDS text messages between smartphones, TETRA terminals, and control room applications such as dispatchers.

The DAMM PTT App can be configured to send GPS position data—which can be viewed by other Apps within the same organization, the DAMM TetraFlex Dispatcher, or any control room application — in selected intervals.

Picture, video and data transfer 
Utilizing the smartphone’s camera and broadband connection, it is possible transfer images and live video to the DAMM TetraFlex control and dispatch management system.

This can be done in a safely, taking advantage of the encrypted and secured IP connection to the TetraFlex Gateway Node.

  • Coverage extension for voice calls, which is ideal for workers commuting between sites and employees in remote offices
  • Low-cost alternative to expensive TETRA terminals for non-critical usage
  • Picture and video transmission for improved workflow
  • Easy sharing of status information and fleet management across a nationwide networks


Security 
An important and vital subject of business critical communication is the possibility of enhanced security. 

The DAMM TetraFlex network and the DAMM PTT App ensures any smartphone connection must be authenticated either by the smartphone or by the DAMM TetraFlex network or even mutual, similar as for standard TETRA terminals.

A minimal configuration for a private IP network can be made by just connecting the Terminal Gateway to a Wi-Fi access point, but for a public IP networks DAMM recommends using secure and encrypted VPN tunnel to each device.

This can be obtained by using a Cisco ASA AnyConnect Firewall Router together with Secure Mobile Client. The DAMM PTT App can be configured to initiate the VPN client automatically at start up.

The high-secured AES256 bit encryption algorithm method can be used in combination with the user PIN code to access the connection and to protect integrity and communication.

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