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Inmate Phone Calls

Inmate Phone Calls

The inmate phone call is a vandal-proof, anti-violence phone with an LCD display that is ideal for prison communications.If you would like to consult or order inmate phone calls, please contact us at marketing@koontech.com or online server, we will provide you with competitive prices.
inmate phone calls description

Inmate Phone Calls

       The inmate phone call using a metal casing, has a destructive character. Prison call, with high-definition LCD display, 16 external metal buttons, use magnetic hook, the phone hangs up automatically when the phone is hung up, use metal phone line, prevent tearing.

1. With auto-dial function ( also can set with four groups speed-dial number according to requirements)
2. Storage number can be modified freely.
3. With total function of normal phone
4. Vandal resistant and tamper-resistant hardware
5. Applicable for all the environment either unattended or attended

LCD Display

  • Caller ID
  • Date
  • Dialing number
  • Conversation time counting
  • Imput bank card number
  • Can add or Minus function according to buyer’s need.

How to clear out number:
1. Open phone box, put the switch “1” to “ON” side on the PCB mainboard.
2. Connect telephone line and pick up the handset
3. Press the storage key (which have stored the number) twice.
4. Put the handset back on hook and put the switch “1” back to “1” side.

Main Product features

1.Robust aluminium alloy die-cast body.

2.Full keypad with memory,10 button or 4 button programmable speed-dial telephone,Iiluminated button optional.

3.Weatherproof standard, service temperature range from:0°C to +75°C.

4.Magnetic reed hook-switch.

5.Telephone Line powered.No external power or battery back up required.

6.Lightening protection to ITU-T recommendation K.21.

7.Handset:made of special engineering plastic, high anti-knock resistance,Weatherproof,armoured cable optional.

8.Hearing Aid compatible receiver,Noise canceling microphone.

9.Handset integrity wiring to enable the telephone system to check if the telephone unit is still operational.

10.Selectable 7 minute time out,to release the line if the handset is left off hook.

11.Vandal resistant and tamper-resistant hardware.

12.Easy installation/replacement.


 inmate phone calls install view

Main PCB

    1.Well treated PCB used inside the phone.

    2.Robust screw terminals used for the connection of ringer,handset,line in,hookswitch.

    3.Selectable 7 minute time out,to release the line if the handset is left off hook.

    4.All connectors be greased in production.


    1.Kirk electro dynamic transducer for both handset transmitter and receiver.

    2.Spring cable or armoured cable to attach the handset to the telephone main unit.

    3.Stainless steel cable to connect exchange.

    4.Inductive coupler fitted for hearing aid compatibility.

    5.Handset integrity wiring to enable exchange to check if the phone is still operational.


    Connection type:Rj45 Socket inside sealed enclosure 

    Power supply:External 5V dc

    Call set-up Protocol:Session Initiation Protocol(SIP)

    Configuration:DHCP or STATIC IP address provisioning

    Packaging specifications
    Machine size:280 *148 *130( mm )     
    Carton size:340 *235 *165( mm )
    Packaging material: pearl cotton, carton
    Gross weight:3KG
    Net weight:2.6KG

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==>>>> Product Specification


1.Applicatble for various types of SPC exchange and dispatching exchange system with feeding voltage of 33v-60v.

2.Ambient temperature:-30°C-70°C Relative


Atmospheric pressure:86-106Kpa

Circumstance noise:<=60db(A).

3.Sound level of ringing:>=70dB(A).

4.Standard frequency:low frequency group:697,770,852,941Hz,high frequency group:1209,1336,1477Hz,frequency deviation : <=+-1.5%,if service line is a 3km

signal-level: Standard frequency:low frequency group:-9dB+-3dB,high frequency group: -7dB+-3dB,level difference between low and high frequency of conpound signal:2+-1dB,

the total distortion caused by intermoudulation of harmonic wave is lower than the basic level by at least 20dB.

5.Call transmission index:(5KM)SLR<=12,RLR<=-1,STMR>=10,output impedance is 600Ω.

6.Super strong function is avaiable for dialing 12 groups of numbers stored in the memory.(maximum length of each store number is 16 digits)

Tags:Prison Phone,Immate Phone,Prison telephone,Jail telephone

==>>>>Telephone System

Inmate Phone Calls Dispatching Scheme

Inmate phone calls, different general public telephones, prisoner calls need to have certain confidentiality and monitoring. The prisoner's telephone dispatching system uses centralized management of sip server and regionalized management to achieve partition and monitoring integration.

inmate phone calls in inmate phone calls scheme

==>>>>Product Application

inmate phone calls application place

inmate phone calls in the prison inmate phone calls when it is using inmate phone calls application place

==>>>>Product Detailed Pictures

Inmate phone calls detailed (front view,left view)

Inmate phone calls front view Inmate phone calls front view

==>>>>Product Video

==>>>>Please Email US marketing@koontech.com

This product model:KNZD-05 LCD