CooVox-U20 V2

The CooVox-U20 IP Phone System is the second generation of Mini IP Phone System launched by ZYCOO, meanwhile it's the first Mobile IP Phone System with the ability to use the GSM module to connect to the mobile network for mobile telephony.

CooVox-U20 is a next-generation smart IP PBX System designed and optimized for today’s business telecommunication needs. CooVox-U20 is an affordable, scalable, interoperable, secure and reliable solution which provides not only traditional PBX features such as Automated Attendant and Voicemail, but also many advanced features including Remote Extensions, Conference Bridge, Call Recording, Call Detail Records (CDR), Automatic Call Distribution (ACD), Web Dial, Unified Messaging (Voicemail to Email), and many more features.

CooVox-U20-A202 2 0
CooVox-U20-A211 1 1

GSM is optional 


Call Features
Call Back
Call Forward
Call Hold
Call Paging and Intercom
Call Park
Call Pickup
Call Queue
Call Recording
Call Routing
Blind Transfer
Attendant Transfer
Call Waiting
One Number Stations
Caller ID
Dial by Name
Music On Hold/Transfer
3-Way Conference
Video Call

PBX FeaturesBlack List
BLF (Busy Lamp Field)
CDR (Call Detailed Record)
Conference Room (20 Rooms)
Call Monitoring
DID (Direct Inward Dialing Number)
DISA (Direct Inward System Access)
Distinctive Ringtone
DND (Do Not Disturb)
DNIS (Dialed Number Identification Service)
Feature Codes
FOP (Flash Operation Panel) Status Monitoring
Follow Me
IVR (Interactive Voice Responses)
Mobility Extension
Multi-Language Prompts
Multi-Language GUI
One Touch Recording
Phone Book(LDAP Server)
Phone Provisioning
Pin Set
Record File Download
SIP Register with UDP/TCP/TLS
SIP Trunk
Skype for SIP
Smart DID
Speed Dial
SRTP (Secure Realtime Transport Protocol)
T.38 Fax (Pass-through)
Time Based Rule
Voicemail & Voicemail to Email

System Capacities
Up to 15 Concurrent Calls
Up to 20 Conferences
Up to 30 IP Phone Registers/Extensions
Recording: 36,000 mins (.gsm); 4,000 mins (.wav)
Voicemail: 36,000 mins (.gsm); 4,000 mins (.wav)

Codecs & Protocols
Audio Codecs: G.722/G.711-Ulaw/G.711-Alaw/
Video Codecs: H.261/H.263/H.263+/H.264
Protocols: SIP (RFC3261)/IAX2

Network Features
DDNS Client
DHCP Server
IP Assignment (PPPoE/DHCP/Static)
SNMP v1/v2
Static Route Table
Trouble Shooting (Ping/Traceroute)
VPN Client (N2N/L2TP/PPTP/OpenVPN/IPSec)
VPN Server (PPTP/L2TP/OpenVPN/IPSec)

Security Features
Refuse SIP Register DoS
Refuse Abort Invite DoS
Refuse SSH Login DoS

Web Access Log
PBX Debug Log


Hardware Interfaces
1 Reset Button
1 Power Interface
1 Ethernet Interface
2 Analog Ports (FXO/FXS)
1 USB 2.0 Interface for Storage
1 Console Port

Hardware SpecificationsProcessor: DualCore A7(1GHz)
Storage: 8GB SD Card(Industry Standard)
Power Supply: Input AC 100~240V, 50/60Hz;
Output DC 12V/1A

Working Temperature: 0 ~ 40°C
Storage Temperature: -20 ~ 55°C
Humidity: 5 ~ 95% Non-condensing

Applicable Modules


FXO-200  FXS-200 FXOS 1GSM  


Inner Box Dimension 280 mm × 150 mm × 65 mm
G.W./Unit 0.8 kg
Carton Dimension 340 mm × 330 mm × 330 mm
Units/Carton 10 Units
G.W./Carton 10 kg


Name Version Size Release Date Download
CooVox-U20 V2 Datasheet V1.0 1.03 MB Jan. 20, 2016
CooVox-U20 V2 QIG V1.0 1.07 MB Jan. 27, 2016
CooVox_V2_User_Manual V2.1.3 3.40 MB Jan. 28, 2016
WebRTC Manual V1.0 1.06 MB Jan. 28, 2016
CooVox-U20 V2-WebRTC V1.0 Patch1 2.73 MB Jan. 21, 2016
CooVox-U20 V2 Firmware V2.1.3 1.27 MB Feb. 02, 2016