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Prison Phone

Prison Phone

model:KNZD-05 LS
material:Cold-roll steel sheets

prison phone-analogue
User Manual ZD Series IP
User Manual ZD Series Analogue
Prison phone, with metal shell, has the function characteristic of explosion-proof and destruction-proof. The prison telephone is installed with a lock, which makes the phone have the function of anti-detachable.
prison phone description

KNZD-05LS Prison Phone

   KNZD-05LS customer service phone/prison phone is mainly designed for Banks, prisons, supermarkets, tourist areas, etc. The machine is high-grade and beautiful, all stainless steel body, excellent waterproof and dustproof performance; The 11-bit zinc-alloy key is wear-resistant and corrosion-resistant, and the handle transmitter and receiver has excellent anti-noise performance, which can effectively filter background noise.

We can provide the prison Telephone System.

The current prison allows prisoners to take the initiative to call their relatives and friends, a safe, effective and easy to manage telephone system is essential. The traditional analog telephone system is not only difficult to install, but also difficult to maintain and manage, and has high fees. Now we can provide a prison phone system based on ip pbx technology for the prison, which uses network signals to communicate. Using the most advanced ip pbx technology, it is easy to install, easy to manage, and can be controlled in the control room, controlling outgoing calls, monitoring, and recording. The most important calls are completely free. If you need it, we will provide customized, prison phone solutions and provide professional technical support.

Can you have a phone in prison?

No, the number of prisons is not allowed for prisoners to own mobile phones. The prison will install a strong voip prison phone to help prisoners contact the outside world.

How long do inmates get to tall on the phone?

The prisoner's talk time is usually determined by the regulations of different prisons, and some prison talk time is 10 minutes or 15 minutes. Every time the call arrives, the voip prison call will automatically hang up.

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.


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

==>>>> 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)

==>>>>Telephone System

Prison phone dispatch system

The prison telephone dispatching system aims to solve the complexity, suddenness, hierarchical scheduling and confidentiality of prison telephones.

prison telephone dispatching system

==>>>>Product Application
prison phone application prison phone application prison phone application

==>>>>Product Detailed Pictures

prison phoneprison phone prison phoneprison phone

==>>>>Product Video

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

This product model:KNZD-05 LS


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