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Inmate Phone Calls

Inmate Phone Calls

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

Inmate Phone Calls-Analogue KNZD-05LCD1
Inmate Phone Calls-VoIP KNZD-05LCD1
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 front view

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

Main Product features

1. Cold-roll steel body, vandal & tamper-resistant hardware, easy installation.
2. Waterproof rating IP55 dust proof.
3. Full keypad with memory, 10 button programmable telephone, support free dial.
4. Magnetic reed hook-switch, with LCD display.
5. Lightening protection to ITU-T recommendation K.21.
6. Heavy duty handset with hearing aid compatible receiver, noise canceling microphone.
7. Handset with industrial strong metal cord.
8. POE power supply or DC12V.
9. SUS keypad keep waterproof and dusty proof.
10. Temperature range from -40 degree to +70 degree. 11. Support echo cancellation, wall mounted type.
12.Remote software upgrade, configuration and monitoring.
13.Optional 7 minute time out to release the line if the handset is left off hook. Optional
14.Powder coated in UV stabilized polyester finish.
15.The housing covered with a layer of reflective label for easy identification at night. Optional
16.Application: Prison, bank, airport, school, metro, railway station, LRT, hotel, supermarket and pedestrian areas in cities etc.

 inmate phone calls

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
Unit size:280*150*130mm   Unit: N.W:2.37KG
1pcs packing box size: 320*190*190mm      Unit N.W:2.37KG   Unit G.W:2.9KG 
6pcs in 1 outer Carton box: size: 510*370*390mm  N.W:14.22KG  G.W:18.44KG

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==>>>> Product Specification


VoIP SIP2.0 telephone                        DTMF dialing                           Audio Codes:G.711, G.722, G.729
MTBF:100000hours                            MTTR: 2 hours                        Network:10/100 BaseTX Ethernet, RJ45
Free dial (maximum length of each number is 16 digits)                     connectors, Cat5e or better
Communication: Full duplex 2-way hands-free                                    IP Protocols:IPv4, TCP, UDP, TFTP, RTP, RTCP,
communication                                                                                    DHCP, SIP
Call Control Signaling:VOIP SIP Info(DTMF), RFC                              LAN Protocols:Power over Ethernet(PoE,802.3af),
2833(DTMF)                                                                                       WLAN(IEEE 802.3af), Network Access
Power:Power over Ethernet, IEEE802.3af, Class 0                             Control(IEEE 802.1x),STP(IEEE 802.1d),
Local power, 12VDC,Idle 2W, Max 10W                                               RSTP(IEEE 802.1d-2004)
Auxiliary Contacts:1 Aux Output, dry contact                                       Programming:Non-volatile flash memory
Contact Ratings. Load: Resistive load                                                 programming and configuration through Web GUI
Rated load:0.3 A at 125 VAC; 1 A at 30 VDC                                       Management and Operation:DHCP and static IP,
Rated carry current:1A                                                                         remote automatic software upgrade, centralized
Max.switching voltage:125 VAC,60VDC                                                monitoring, status LED
Max.switching current:1A                                                                      Echo cancellation code:G.167/G.168

The KNZD-05LCD Analogue

1.PSTN analogue telephone
2. DTMF dialing
4. MTTR: 2 hours
5. Connection: RJ11 screw terminal pair cable
6. Applicable for various types of SPC exchange PABX and dispatching exchange system with feeding voltage of 33-60V. 7. Ambient temperature:-30 ~ +60 degree. Relative humidity:10%~95%
Atmospheric pressure: 86~106Kpa Circumstance noise:less than 60dB(A)
8. Sound level of ringing:over 70dB(A). 9. Standard frequency:low frequency group:697. 770.
852. 941Hz, high frequency group:1209. 1336. 1477Hz, frequency deviation:-1.5% ~ +1.5%
10. Call transmission index:(5KM)SLR<12,RLR<-1,STMR>10, output impedance is 600 Ohm. maximum distance: 7KM
11. Super strong function is available for dialing 4 groups of numbers stored in the memory (maximum length of each number is 16 digits)
12. Connection: RJ11 screw terminal pair cable (or RJ11 Socket of plug upon request) with stainless steel cable protected

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 viewInmate phone calls front view

==>>>>Product Video

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

This product model:KNZD-05 LCD