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C520 SIP Conference Phone

Whether you run a small business from a home office, or collaborate in a large conference room, the Snom C520 SIP conference phone uses Bluetooth® and DECT 6.0 technology for frustration-free calls and meetings. The system serves as a personal workspace device, while replacing the need for a separate deskset and conference phone. Connect your cell phone, or pair a Bluetooth or DECT headset with the speakerphone for hands-free and/or private calls. The C520 can go beyond the office, and work in any-size conference room. The system—with one fixed built-in mic and two wireless mics can support nine or more active participants in a small conference room. Or, it can easily scale up with the accessory C52-SP DECT expansion speakerphone to handle 27 or more active participants. Now, you can clearly hear, and spread out and speak without shouting.

Quick summary

  • Full-duplex speakerphone in base
    Callers can speak and be heard at the same time, just as they would in a face-to-face meeting.
  • Flexibility
    With support for up to three SIP lines/accounts, you can manage multiple calls with advanced call handling features.
  • Wireless expansion
    Collaborating in a large conference room? Pair up to three C52-SP DECT Expansion Speakerphones to increase the volume and microphone pickup for 27 or more active participants.
  • Intuitive design
    You're in business with a user-friendly interface, large backlit display, three soft keys and navigational pad.
  • Bluetooth connectivity for headset and mobile devices
    Bluetooth enables hands-free calls and connectivity to headsets and mobile devices. Make and receive cellular calls on the speakerphone, or pair your favorite headset to the speakerphone for a private conversation
  • HD voice quality
    With G.722 wideband codec support for HD audio, calls have never sounded so rich and life-like.
  • DECT 6.0 wireless microphones
    Portable, wireless microphones allow everyone to collaborate beyond the conference table.
  • Up to 12 hours of talk time per wireless microphone
    With 12 hours of talk time for each microphone, you have plenty of room to keep the meeting going on one charge
  • Up to 70 hours of standby time per wireless microphone
    With up to 70 hours of standby time for each microphone, there's no need to worry about losing a charge midmeeting.
  • Built-in wireless microphone charging bays in base
    Magnetic charging bays in the base keep the microphones together and ready for the next call.
  • Operable in small, medium and large rooms
    With a base speakerphone, one fixed and two wireless microphones, ErisStation is a flexible solution for any size conference room.
  • 2-year standard warranty
    Enjoy the peace of mind that comes with an industry-leading, standard two-year warranty.
  • Automatic gain control
    Digital mixing, Volume Control: 10 levels
  • 3-way local conference
  • N-way network conference
  • Local phonebook up to 200 entries
  • Call history up to 200 entries

Product video:

Specifications, Weights and Dimensions

  • Color: GM (Gun Metal)
  • APN: 80-S041-00
  • UPC: TBD
  • Product dimensions (WxDxH): Base: 10.59" x 11.10" x 3.23" Wi-Mic: 1.82" x 2.99" x 0.99"
  • Product weight: 3.38 lbs.
  • Giftbox dimensions (WxDxH):12.36" x 15.55" x 4.33"
  • Giftbox weight: 4.89 lbs.
  • Master pack dimensions (WxDxH):12.83" x 8.98" x 16.26"
  • Master pack weight: 11.05 lbs.
  • Quantity: 2


  • DECT 6.0 RF module embedded
  • DECT 6.0 (5 maximum registers): 2 wireless mics, 1 cordless headset A171 and up to 3 expansion speakerphones C52-SP
  • Bluetooth: 2 connections
  • Bluetooth supported profiles: HFP(1.6), HSP(1.2), A2DP(1.2), AVRCP(1.4)
  • Ethernet port: 10/100MB
  • Base power: Class 3 Power over Ethernet(PoE) or included AC adapter

Physical Features

  • 158 x 57 pixels (w x h) LCD resolution with backlight (white)
  • 3 soft keys with 4-way navigational pad
  • DECT 6.0 wireless microphones
  • Built-in wireless microphone charging bays in base
  • Includes two wireless microphones and one fixed microphones
  • Active call indicator; green LED on base unit and wireless microphones
  • Mute indicator; red LED on base unit and wireless microphones
  • Wireless microphone battery-low indicator; flashing LED
  • Wireless microphone auto power off; when base powered off
  • Operable in small, medium and large rooms
  • AC adapter required (included)


  • Full-duplex speakerphone in base
  • Fast adaptive feedback control
  • Acoustic echo cancellation technology
  • Comfort noise injection
  • Enhanced noise reduction/Dynamic noise reduction (DNR)
  • Automatic gain control
  • Digital mixing
  • Volume control: 10 levels

Phone Features

  • Supports up to 3 SIP account registrations
  • 10 ring tones/melodies; 10 ring levels
  • 10 speed dial entries
  • Pre-dialing with editing
  • Local phonebook up to 200 entries
  • Phonebook import/export
  • LDAP/Broadsoft® remote phonebook
  • Call history up to 200 entries
  • Alpha phone book search
  • Number saving from CID log to phonebook or blacklist
  • Do Not Disturb (DND)
  • 3-way local conference
  • N-way network conference
  • Call barring/blocking (block anonymous/ blacklist)
  • Dial plan/digit map
  • Caller ID
  • Call transfer
  • Call hold
  • Call forwarding: per-line basis (busy/always/no answer)
  • Call timer (call duration)
  • Phonebook matching (incoming and outgoing calls)


  • Soft key configuration
  • Custom startup and idle logo
  • Web interface configuration (admin & user)
  • Custom default file


  • Up to 70 hours of standby time per wireless microphone
  • Up to 12 hours of talk time per wireless microphone


  • 802.1x
  • 802.1pq
  • Transport Layer Security (TLS)
  • AES encryption of config file for provisioning (128/64/32/16 bits)


  • STUN
  • NAT
  • SNTP
  • VLAN
  • Layer 3 QoS (ToS, Diffserv)

Voice Codec

  • G.711 a-law & u-law
  • G.722
  • G.726
  • G.729


  • DHCP Options: 66, 159,160
  • Web interface configuration (admin & user)
  • PnP


  • Diagnostic: pcap trace
  • Schedule Resync - time and day setting
  • Syslog


  • Broadsoft Broadworks®
  • Asterisk-based platforms
  • Metaswitch Networks


  • Eco mode (talk mode)
  • 2-year standard warranty