U Series Phone Systems

PBX Appliances

Modular & Fixed configuration PBX systems with models designed for SOHO, SMB & Enterprise applications.

Standard Architecture

You'll never be stuck with proprietary hardware or software as our PBXs are built with Intel processors and run open source software.

Built-in Voicemail

All models come standard with large capacity Advanced Voicemail System.

Intel Based

Non-proprietary hardware based on standard intel architecture.


Open source software with no recurring licensing fees.

TDM Interfaces

Support for a wide variety of TDM interfaces.


Quality products backed by outstanding support!


Custom Greetings!

Greet your customers with custom prompts

Call Routing

Automatically route calls to the right department

Improve Bottom Line!

Customers spend less time waiting for their call to be answered

Lower Costs!

No need for dedicated staff waiting to answer calls! Employees can focus on more important things


Interactive Voice Recognition

Call Queues

Manage high inbound call volume


Setup multiple conference rooms


Built-in Paging & Intercom module

Advanced Voicemail System

Large Capacity

With 100s of hours of voicemail space included, you'll have plenty of space for voicemail for all users


Never miss any voicemails! New voicemails are instantaneously sent to your inbox


You can personalize your voicemail by setting personal greetings, etc

Do Not Disturb

You can send all calls directly to voicemail with DND mode


Built-in Firewall, SIP Security & VPN.

Remote Extensions

Use smart phones as extensions!


Deploy large number of phones with Ease!

XML Phonebook

Up-to-date company directory on phones!

Fax Support

Support for traditional fax machines and advanced fax-to-email features

Fax Machines

Traditional fax machines are supported. You can send and receive paper faxes just like you do today

Fax Detection

Fax calls are automatically detected and redirected to fax machine or converted to PDF, depending on the configuration


With fax-to-email feature, inbound faxes are delivered as emails. Save money by using less paper & be green at the same time


See who's calling you with Caller-ID feature.

Call Forward

You can forward all your calls to cell phone or home phone with the call forward feature

Call Waiting

With the call waiting feature, you'll never miss a call when you are busy on another call.

Do Not Disturb

With DND feature, you can forward all calls directly to voicemail!

Follow Me

Never Miss a Call!

With Follow Me, you can configure a list of phone numbers to direct your calls to if your office extension is not answered!

Multiple Destinations

You can set multiple phone numbers such as your mobile phone, home phone or any phone number anywhere in the world. Follow Me feature will try each destination one after the other until the call is answered.

Unanswered Calls

Timeout can be set for each destination. If the call is unanswered or times out before being forwarded to voicemail at any of the destinations, unreachable message is played to the caller.

Quick Comparison Chart

  • Intel ATOM D2550
  • 2GB DDR3
  • 32GB SSD
  • 160,000 Mins
  • 12
  • 48
  • 100
  • 2FXO & 2FXS
  • No Support
  • 3
  • 2 x Gigabit Ethernet
  • Desktop
  • Intel ATOM D2550
  • 2GB DDR3
  • 32GB SSD
  • 160,000 Mins
  • 12
  • 48
  • 100
  • 4FXO & 4FXS
  • No Support
  • 3
  • 2 x Gigabit Ethernet
  • Desktop
  • 500MHz DSP (DC)
  • 256MB DDR2
  • 4GB SD Card
  • 21,000 Mins
  • 3
  • 20
  • 50
  • None
  • 2 Slots
  • 1
  • 1 x Fast Ethernet
  • Rack Mount / Desktop
  • Intel ATOM D2550
  • 2GB DDR3
  • 500GB SATA
  • 2,500,000 Mins
  • 12
  • 80
  • 500
  • None
  • 2 Slots
  • 2
  • 2 x Gigabit Ethernet
  • Rack Mount / Desktop
  • 3.5", 480x320px
  • 3
  • 4
  • 3.5", 480x320px
  • 4
  • 14

Back Panel Explained

Additional Information

Call Features
Paging & Intercom Call Forward Call Waiting Call Park Call Hold Call Routing
3-way Conference Dial by Name Call Pickup Call Queue Caller ID Call Back
Call Recording Call Group Music on Hold Music on Transfer Attended Transfer Blind Transfer
PBX Features
CDR Phone Provisioning Black List Mobility Extension Phone Book BLF
Conference Room DISA Auto-Attendant Record File DID Skype for SIP
Status Monitoring Speed Dial DNIS Smart DID Feature Codes DND
FOP Call Monitoring Follow Me SRTP SIP Trunk Spy
IVR Distinctive Ringtone T.38 FAX Voicemail Time Based Rules Pin Set
Virtual Fax Fax to Email Voicemail to Email One Touch Recording    
Multi-Language GUI Multi-Language Prompts UDP/TCP/TLS for SIP Register      
System Capabilities
SIP (RFC3261) IAX2 DTMF: RFC2833, SIP INFO, In-Band    
Video Codecs: H.261, H.263, H.263+, H.264 Audio Codecs: G.722, G.711,-Ulaw, G.711-Alaw, G.726, G.729, GSM, SPEEX
Network Features
DDNS Client DHCP Server TR069 SNMP v1 & v2    
IPv4, IPv6, IEEE 802.1Q Static Routing Table Ping & Traceroute IP Assignment: PPPoE, DHCP, Static
VPN Server – PPTP, L2TP, OpenVPN VPN Client – N2N, L2TP, PPTP, OpenVPN
Security Features
Firewall Refuse SIP Register DoS Refuse Abort Invite DoS Random Password Generation        
PBX log Web access log PBX debug log          

TDM Modules for U50 & U100 PBXs

4 Port FXO Module

4 Port FXS Module

2 Port FXO & FXS Module

Single Span T1/E1 PRI Module

4 Port GSM Module

2 Port GSM Module

4 Port FXO Module

32 channel Echo Cancellation Module (internal)

UMTS Module (internal)