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SNOM 821 Datasheet



SNOM 821 VoIP Telephone


SNOM 821 VoIP Telephone

The SNOM 821 VoIP phone unites two of the biggest requirements for modern telephony in one device: extraordinary VoIP technology and design. The SIP-based phone is optimized for professional use, from a technical standpoint as well as from its look.

The SNOM 821 comes with an integrated 1 Gigabit switch on board which enables connected devices to benefit from all modern network installations. With its high-resolution TFT color display the SNOM 821 offers a brilliant depiction of call lists, phone directories, and caller information via the integrated XML browser.

The wideband technology (snom klar-VOICE) used in the handset makes the user feel as if the caller were in the same room. In hands-free-mode, a Class D amplifier reliably suppresses interference noise.

Main Features

  • High-resolution TFT color display
  • Integrated 1 Gigabit switch
  • Large call indication LED
  • 37 keys, 9 LEDs
  • Local 5-way-conference
  • 4 freely programmable and 16 customizable function keys
  • 12 virtual keys
  • Full duplex speakerphone
  • WLAN ready through USB Type A
  • Excellent quality through wideband audio (snom klarVOICE)
  • Power over Ethernet
  • SIP RFC 3261
  • Security: SIPS/SRTP, TLS
  • STUN, ENUM, NAT, ICE and IEEE 802.1X
  • National language support
  • XML mini browser


Moreover, the SNOM 821 offers all conveniences snom customers have come to expect from the German company. Furthermore the SNOM 821 includes the use of secure VPN as well as TLS and SRTP, making it almost impossible to hack or misuse data. The SNOM 821 comes ready to be used with the snom WLAN adapter through the USB Type A connector on the phone.

The SNOM 821 also offers a wide range of functions particularly relevant to the business world, like 5-way-conferencing, multiple ringtones, and up to twelve different SIP identities. The user interface was designed for clarity and intuitive operation.

All keys are extremely easy to see and reach from almost any angle, whether the SNOM 821  is set up with the footstand in high (55°) or low (33°) position! The look of the snom 8xx series was designed in cooperation with one of the most renowned German industrial designers.

The SNOM 821 gives the discerning user comfortable access to numerous business functions that have become matter of course in today’s telephony.

  • High-resolution TFT color display
  • 3.5”, 320 x 240 pixels
  • 37 keys, 9 LEDs
  • 4 freely programmable and 16 customizable function keys
  • 12 virtual keys
  • Comfortable and intuitive menu structure
  • Incoming call indication via LED
  • Caller identification on display
  • LED indication for missed calls and new messages
  • Directory (up to 1000 entries)
  • Import/export of directory
  • Speed dial
  • Local dial plan
  • Lists of missed, received, and dialed calls (250 entries each)
  • Indication of calls on hold
  • Clock with automatic daylight-saving time, call duration
  • Call blocking (deny list)
  • Blocking of anonymous calls
  • Handling of up to 12 calls simultaneously Auto answer mode
  • Ringtone selection, VIP ringtones, import of individual ringtones
  • URL dialing support
  • Multiple language support
  • DND mode (do not disturb)
  • Speakerphone (full duplex)
  • Keyboard lock

  • Extremely easy WLAN connection via USB
  • Hold
  • Unattended and attended transfer
  • Music on hold (if supported by PBX)
  • Call forwarding
  • 5-way conferencing (bridge on phone)
  • Call park, call pickup (if supported by PBX)
  • Call completion on busy/not available
  • Client Matter Code (CMC)
  • Call waiting/switching between calls
  • Automatic Redial
  • RTP multicast paging
  • Multiple audio device support (i.e. Bluetooth)
  • Unified Communications with snom CTI und snom OCS edition

e-NETSource Video

SNOM 821 - The 8 experience - official version

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