CooVox-U50 IP Phone system is the ideal solution for SMBs with up to 100 extensions. Adopting an innovative modular design, means it is very convenient to add telephony ports to expand the Phone system. CooVox-U50 supports industry standard SIP trunks as well as analog PSTN trunks(FXO module), mobile GSM trunks(GSM module), analog stations (FXS module), as well as digital trunks (E1/T1 module).

CooVox-U50 is a next-generation Hybrid IP PBX system designed and optimized for today's business telecommunication needs.

CooVox-U50 is an affordable, scalable, interoperable, secure and reliable solution which not only provides traditional PBX functions such as automated attendant and voicemail, but also many advanced features including remote extensions, remote office connection, conference bridge, call recording, call detail records (CDR), automatic call distribution (ACD), unified messaging (voice mail to email), and many more features.

U50 Module | U50 Slot Slot1 Slot2
4BRI ×
1PRI(E1/T1) ×

Slot 2 is for Analog/GSM Modules only


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

PBX Features
Black List
BLF (Busy Lamp Field)
CDR (Call Detailed Record)
Conference Room (3 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
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
Virtual Fax
Voicemail & Voicemail to Email

System Capacities
20(Max) Concurrent Calls
Up to 100 IP Phone Registers/Extensions
Recording: 21,000 mins (.gsm); 3,000 mins (.wav)
Voicemail: 21,000 mins (.gsm); 3,000 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)
VPN Server (PPTP/L2TP/OpenVPN, Up to 10 Users)

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
1 Console Interface
1 USB Interface
1 Hardware Echo Cancellation Interfaces (Onboard)
1 UMTS Interface for 3G Data (Onboard)
Slot 1 for ZYCOO Analog/GSM/PRI/BRI Module
Slot 2 for ZYCOO Analog/GSM Module

Hardware Specifications
Processor: DualCore 500MHz DSP
Storage: 4GB SD Card
Power Supply: Input AC 100~240V, 50/60Hz;
Output DC 12V/2A

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

*PSTN is not perferctly supported temporarily in UK

Applicable Modules

      4fxo  4fxs 2fxos

2gsm 4gsm 1pri

4bri 1um 1399884979


Inner box 420mm × 230mm × 100mm
G.W./unit 2.14 KG
Carton MEAS 530mm × 430mm × 240mm
Units per Carton 6 units/ CTN



ItemVersionSizeRelease DateDownload
CooVox-U50 V1 Datasheet V1.0 988.95 KB Aug. 29, 2014   download icon
CooVox-U50 V1 Firmware V1.0.5 13.45 MB Aug. 29, 2014   download icon
CooVox-U50 V1 Firmware Patch1 V1.0.5 Patch1 807.11 KB Aug. 29, 2014   download icon
CooVox-U50 V1 Firmware Patch2 V1.0.5 Patch2 3.50 MB Aug. 29, 2014   download icon
CooVox-U50 V1 Firmware V1.1.0 4.48 MB Jan. 05, 2015   download icon
CooVox-U50 V1 Firmware V1.1.1 6.27 MB April 8, 2015 download icon
CooVox-U50 V1 Firmware V1.1.2 6.27 MB Nov. 22, 2015 download icon
CooVox-U50 V1 Firmware Latest Version V1.2 8.04 MB March 25, 2016   download icon
CooVox-U50 V1 Security Patch V.1.0 1.70 MB Jan. 27, 2016   download icon
CooVox Series User Manual (Admin) V1.0.5 3.04 MB Aug. 29, 2014   download icon
CooVox Series User Manual (Ext. User) V1.0.5 634.75 KB Aug. 29, 2014   download icon
CooVox-U50 V1 QIG V1.0 915.31 KB Aug. 29, 2014 download icon
CooVox Module Setting Guide V1.0 1.37 MB Aug. 29,2014   download icon