RT4 Series Mini IP PBX


RT4  is one kind of  the smallest all-in-one  IP-PBX in the market  for home or small office, featuring built-in  analog  phone  interfaces  (FXS  ports), CO  line  interfaces  (FXO ports), and SIP  trunks  and SIP client licenses. It has many features that only much more expansive IP-PBX will offer.   RT4 can be put on any flat surface or mounted on wall.



RT4 is the Mini all in one IP PBX phone system for home users or small office, RT4 provide 2 analog extensions or CO lines, and 8 SIP users license,  also the SIP trunks to connecte with ITSP for least cost calls;

RT4 supports  remote  extensions,  so that you can communicate  with  family or customers  and  team members at home or on the road. RT4 offers rich features to meet current and future needs of home users and small office;

RT4  IPPBX provides many  features  to  improve  your  customer  caring, which  can  only  be  found  in  expansive PBX.  It  has  configurable  greetings  and  reminders  for  the  business hours and close hours. The remote attendant function allows small office to provide 7x24  services  without  expensive  cost. With  RT  you  can  provides  quality  services  for  less investment.

RT4  IP PBX  has  all  the  IP  remote  calling  functions  you  need  for  home working,  business traveling, and communication among branches through intranet. The international call or long distance calls are turned into local calls or toll free calls. With the advanced routing capabilities RT routes calls intelligently according to call types

Technical Specs

Automated attendant
Interactive voice response (IVR)
Working  hour  and  non-working hour service
Changing  automated  attendant profile on a fly
Operator  group  (Up  to  5 operators)
Operator console


Incoming call
Direct inward dialing (DID)
Direct dialing in (DDI)
Calling  line  identification  (CLI)
Call block
Ring tone pattern selection
Call waiting

Group receiving
Extension group
Group call distribution
Group ringing


Extension receiving
Call forking (Ring simultaneously another pre-selected terminal)
Call forwarding (FWD)
Do not disturb (DND)
Ring pattern selection
Color ring back tone

Call pickup
Directed pickup
Group pickup
Pickup operator’s call only

Making call
Intercom call
Account code entry

Outgoing line preference
Trunk group  
Speed dialing
Hot line (Immediate, delay)  
Caller ID block
Emergency call

Outside access
Direct  inward  system  access (DISA)
Call back  
Remote  extension  setting  on phone

Call restriction
Toll restriction/Call barring  
Budget management
Extension lock
Verified code entry

Automatic route selection

Call transfer
Blind call transfer
Consultation call transfer
Call transfer to CO line

Call hold
Call hold
Call park
Music on hold


3-way calling

Caller ID
Caller ID
Incoming call log

Message notification
Voicemail  message  waiting(FSK, polarity reversal)

Extension recording
On the fly recording

Audible tone
Dial tone
Confirmation tone
Stutter dial tone


CO line (FXO)
Polarity inverse detection
Caller ID detection
Busy tone detection
DTMF outpulsing delay
Volume control

Subscriber line (FXS)

Polarity inverse generation
Caller  ID  generation  (FSK,
Ring cadence setting  
Ring frequency setting
Volume control
Ring volt 60V RMS
Ring Frequency 20-25Hz

Other calls features
Music on hold
Color ring back tone

SIP trunk
Registration per line
Registration per system

Tie trunk service
Direct internal dialing
Call forwarding
Call transfer
Outbound trunk sharing

Other SIP connection
Peer-to-peer SIP communication


SIP extension
Busy line field (BLF)

PC assistant
Contact list
Short message  
Retrieving  voice  mail  and
recording file
Call log

NAT traversal
IP address filtering for security

Media stream processing
Codecs: G.711, G.729A,  
Echo cancellation
Jitter  buffer  automatic
Busy tone detection


Not-Telephone Terminal

Fax  transmit  and  receive  (T.30 and T.38)
POS transmit
PBX  connectivity  (Analog  trunk
and analog extension)


System management
Web  management  interface
(Local and remote access)
Firmware upgrade
Log management
Configuration import and export
System  status  monitoring  and




IP PBX system




Model name Analog Extensions CO  lines Ethernet ports SIP users
RT4-1S/1 1 1 2 8
RT4-2S/2 2 2 2 8
RT4-2S 2 0 2 8

Above Models with same software and WEB menu;