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

January 31, 2018 (All day) - February 2, 2018 (All day)
New Orleans
United States
The communications technology landscape is changing daily. IAUG CONVERGE provides the maps and tools you need to navigate it all. IAUG is coming to The Colorado Convention Center for five days of education, networking and innovation. No other event provides a more comprehensive program around integration, managed services, cost management, BYOD, cloud and more.
June 19, 2017 - June 21, 2017
Baltimore Convention Center & Hilton Hotel
United States
The Information Assurance Symposium (IAS) will take place from 19th June to the 21st June 2017 at the Baltimore Convention Center & Hilton Hotel. IAS is the premier NSA information assurance event, providing an opportunity for guests to learn and network from cyber security professionals, subject matter experts and solution providers from throughout Government, industry and academia.

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.