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C52 SP Expansion Speakerphone

The Snom C52-SP combined with either the Snom C520 or C620 is the perfect solution for people who regularly hold teleconferences in large rooms or with large numbers of people. Up to three C52-SP units can be paired wirelessly with the Snom C520 with ease, then serving as fully hands-free modules thanks to the two integrated microphones and powerful speaker. You can also pair up to two C52-SP units with our C620 to make a completely wireless conference solution.

The C52-SP can be moved around anywhere in the room at a distance of up to 50 metres enabled by wireless DECT connection and battery operation. Thanks to the fully automated voice synchronisation of all microphones, all attendees can be clearly understood in optimal HD-Voice quality. The C52-SP speaker also features a very powerful battery for up to 12 hours talk time.

The C52-SP can also be wirelessly connected to any Snom desk phone featuring a USB port when connected with the A230 DECT USB stick.

Quick summary

  • Full-duplex hands-free unit
    With Snom HD-Voice, voices are transmitted in crystal-clear quality through the high-quality speaker and integrated microphone.
  • Snom HD-Voice
    Thanks to the G.722 broadband codec, calls can be made in crystal-clear HD-Voice quality.
  • Up to 12 hours talk time
    The integrated battery in the C52-SP enables talk time of up to 12 hours
  • Up to 70 hours standby
    The C52-SP comes with a battery charge of up to 70 hours standby time or can be operated with the power supply unit provided.
  • Cordless expansion
    Collaborating in a large conference room? Pair up to two C52-SP to your C620 or up to three to the C520 conference phone to increase volume and microphone pickup.
  • Accessory Speakerphone
    Need to add a conference phone to your office? Pair a C52-SP to your Snom deskset using our A230 DECT dongle to add a wireless conference phone to your office. You can even plug the A230 into a computer to use the C52-SP with your favorite communication application.

Product video:


  • C520 or C620 expansion unit for large conference rooms

  • Extensive operating range thanks to the DECT technology
  • Flexible positioning thanks to the battery power supply and DECT technology
  • Up to 2 C52-SP can be used at the same time for every C620
  • Call handling and volume buttons placed on the C52-SP
  • Multicolour status LEDs



  • DECT coupling via the C520 or C620
  • No additional equipment required 


  • Dimensions (ca.): 305 x 305 x 61 mm (LxWxH)
  • Weight (ca.): unit 1.1 kg
  • Input voltage: 12V DC (SELV)
  • Power supply: Batteries or 12V DC power adapter  (included)
  • up to 70 hours battery life in stand-by
  • up to 12 hours talk time
  • DECT connectivity (Up to 3 for C520, 2 for C620 or 1 for A230)
  • Call handling and volume buttons
  • LED status light (call, mute, etc.)
  • Environmental conditions:
    • Operating temperature: from -5°C to 45°C
    • Non-operating temperature: from -5°C to 60°C
    • Humidity: up to 95% (non-condensing)
  • Included in the package:
    • C52-SP
    • Battery for the C52-SP
    • Cable
    • Quick start guide (QIG)
  • Colour: Gun Metal
  • Manufacturer’s warranty: 3 years
  • Product code: 00004415


  • CE Marking

  • IEC 60950 safety


Up to three C52-SP units can be connected to a single C520 at the same time.

To operate, the C52-SP needs either a C520, C620 or A230 and is not compatible with other DECT based devices.(1)

(1) Compatible with:

+ C520 (product code 00004414)

+ C620 (product code 00004407)

+ A230 (product code 00004386)