ST4625TF TEMPEST SDIP-27 Level A VoIP Telephone

The ST4625TF is ideal where a feature rich colour display VoIP telephone is required for TEMPEST environments.

Based on the Avaya 4625SW, the SST TEMPEST VoIP telephone augments the advanced features of the feature-rich OEM with security features such as onboard fibre Ethernet on a choice of ST or SC connectors and push to talk functionality on the handset.

The large colour display provides for 12 application specific or line/feature buttons to be labelled at once on screen, as well as an additional 4 softkeys.

The ST4625TF also supports SIP compliance, SNMPv2, multiple QoS options, 802.1 p/q, LLDP (802.1AB), G.711 G.792A/B G.726a codecs and media encryption capabilities. This feature packed TEMPEST telephone combines industry leading Avaya technology with the proven engineering, integration, and compliance capabilities of SST.

The ST4625TF is designed for the most demanding TEMPEST environments and compliments the range of TEMPEST products, more details of which can be found at

  • Colour 1/4 panel VGA display
  • ST or SC Fibre Ethernet
  • Integral auto-sensing AC power supply
  • SIP Compliant
  • Voice media Encryption
  • Multiple language support
  • 24 programmable feature keys
  • 'Press to talk' button on handset
  • SDIP-27 Level A, UK Manual X Compliant


  • 1/4 VGA Colour display (320x240 pixels)
  • WML 1.3 Browser integrated within display
  • Support of JPEG and WBMP images


  • 3 Application buttons along bottom of display:  Speed Dial, Call Log, Web Browser
  • 10 Fixed Feature Keys:  Speaker, Headset, Conference, Transfer, Redial, Mute, Drop, Hold, Volume Up & Down
  • 24 Programmable Feautre Keys:  Automatically system labelled (no paper)


  • Message waiting indicator
  • 8 Personalized Ring Patterns
  • Voice media encryption
  • Full Duplex Speakerphone


  • 100Base-FX Fibre Ethernet LAN (full duplex)
  • 100Base-FX Fibre Ethernet to PC (option)
  • Dual ST or SC Duplex connectors


  • SIP Compliant
  • 802.3 Flow Control on full duplex port
  • 802.1x Multi-Supplicant support
  • VLAN Support
  • G.711, G.729A/B, and G.726A voice codecs
  • Differv, 802.1p/q
  • Simple Network Management Protocol (SNMPv2)
  • LLDP (802.1AB) simplified management
  • DHCP client and Manual IP Addressing

Lanuage Support

  • English, French, German, Dutch, Spanish, Italian, Portuguese, Russian, Chinese, Korean, Hebrew


  • Push-to-Talk Handset
  • 100Base-FX to Computer
  • Colour Bezel


  • TEMPEST to SDIP-27 Level A (UK Manual X)
  • For use in NATO Zone 0 (SDIP-27 Level A)


  • CE Compliant
  • Safety to BSEN60950


  • Height:  108 mm
  • Width:  340 mm
  • Depth: 195 mm
  • Weight:  2.5 kg


  • Integral Auto sensing AC power supply 110-250 VAC, 47-63 Hz


  • +5 degrees C to +35 degrees C (Operating)

Relative Humidity

  • 20% to 80% RH (Operating, non-condensing)

Recent Events

June 10, 2018 (All day) - June 15, 2018 (All day)
United States
The IEEE MTT International Microwave Symposium (IMS) is the premier annual international meeting for technologists involved in all aspects of microwave theory and practice. It consists of a full week of events, including technical paper presentations, workshops, and tutorials, as well as numerous social events and networking opportunities. The symposium also hosts a large commercial exhibition. Co-located with IMS are the IEEE RFIC and ARFTG conferences.
May 30, 2018 (All day) - May 31, 2018 (All day)
4899 Uplands Drive
Join the Emcon team at CANSEC 2018 as they showcase the latest developments in TEMPEST, rugged, and high security IT solutions for the government marketplace. CANSEC is Canada‚Äôs annual Defence exhibition taking place at the EY Centre in Ottawa. CANSEC is Canada's foremost defence technology showcase. A two-day event, CANSEC will feature 120,000 square feet of indoor exhibits by Canada's leading edge defence and security companies, as well as an outdoor static display. This showcase targets a wide audience of customers that includes Government agencies and departments with an interest in the defence sector.

Certification Note:

This specific product was certified by SST as being compliant to the SDIP-27 standard. SST is a TEMPEST manufacturer and operates a test facility accredited by CESG (UK Government Authority for Information Assurance). Should additional certifications and/or endorsement of the testing methodology and results be required, please contact us about this product.