PT104-3B 3 Button Push-to-Call Outdoor Phone

The Project Telecom PT104-3B is a robust industrial push-to-call telephone engineered to provide dependable voice communications in demanding outdoor, industrial and public-access locations. Combining three programmable call buttons with a durable open access weatherproof design, IP66 environmental protection and vandal-resistant construction, it offers a reliable communications solution for sites where standard telephones are unable to withstand harsh operating conditions. Available with Analogue, SIP or GSM / 4G connectivity, the PT104-3B can be integrated into both traditional and modern communications networks.

Suitable for factories, warehouses, rail infrastructure, transport terminals, utility facilities, ports, marine installations, tunnels, construction sites, car parks and public assistance locations, the PT104-3B enables users to contact one of three pre-programmed numbers instantly. Each stainless-steel push button can be assigned to a different destination, providing fast access to security personnel, maintenance departments, customer assistance, control centres or emergency response teams.

Manufactured from corrosion-resistant die-cast aluminium, the phone is designed to withstand prolonged exposure to rain, dust, moisture and demanding environmental conditions. The open access design eliminates the need for a protective door, ensuring the telephone is immediately accessible whenever assistance is required.

To complement different installation environments, the PT104-3B is available in Yellow, Blue, Red and Grey finishes, making it suitable for a wide variety of industrial, commercial and public safety applications.

Heavy-Duty Construction

Purpose-built for challenging environments, the PT104-3B features a rugged die-cast aluminium housing protected by a durable industrial-grade epoxy powder-coated finish. Its open access design allows unrestricted use while maintaining excellent resistance to harsh weather and everyday wear.

The vandal-resistant enclosure is designed to resist impacts, corrosion, moisture and dust, while tamper-resistant mounting hardware helps protect the installation against unauthorised interference. This robust construction makes the telephone well suited to exposed locations where dependable communications are essential.

Whether installed in industrial plants, transport facilities, utilities, marine environments or public-access areas, the PT104-3B is engineered to provide reliable long-term performance with minimal maintenance.

Three Button Push-to-Call Functionality

Operation is simple and intuitive thanks to three heavy-duty stainless-steel push buttons, each capable of automatically dialling a separately programmed contact.

With a single button press, users can immediately establish communication without entering telephone numbers or navigating menus. Compared with single or dual-button telephones, the three-button configuration provides additional flexibility by allowing direct access to multiple contacts.

Typical destinations include Security, Customer Services, Control Rooms, Maintenance Engineers, Technical Support, Emergency Assistance and Site Management, making the PT104-3B ideal for help points, transport networks and industrial facilities.

Multiple Connectivity Options

To accommodate different communications infrastructures, the PT104-3B is offered with Analogue, SIP or GSM / 4G connectivity.

Analogue Version

The analogue model connects directly to standard analogue telephone lines or analogue PABX systems and draws power directly from the telephone line, eliminating the need for an external power supply.

Additional functionality includes automatic push-to-call dialling, incoming call support, DTMF remote programming, an internal programming keypad and integrated lightning protection for enhanced reliability.

SIP Version

The SIP model supports the SIP 2.0 (RFC3261) protocol and integrates seamlessly with IP PBX systems, hosted VoIP services and enterprise IP networks.

Features include dual SIP account registration, Power over Ethernet (PoE), browser-based configuration, full duplex audio performance and compatibility with widely used voice codecs, providing a flexible solution for modern IP telephony deployments.

GSM / 4G Version

The GSM / 4G model communicates via mobile networks using a Micro SIM card, making it an excellent choice where fixed-line services or network cabling are unavailable.

SMS-based remote programming and status reporting simplify installation, monitoring and maintenance, making this version particularly suitable for isolated sites, temporary installations and critical infrastructure projects.

High-Quality Handsfree Communication

The PT104-3B delivers clear full duplex handsfree audio, allowing users to communicate naturally without the need for a traditional handset.

Its handset-free design improves reliability, reduces maintenance requirements and provides an effective communication solution for busy industrial environments and public assistance locations.

Open Access Weatherproof Design

Unlike conventional weatherproof telephones that require users to open a protective front cover before use, the PT104-3B provides immediate access through its open access front panel.

Its IP66-rated enclosure safeguards internal components against rain, dust and moisture while ensuring the call buttons remain instantly available whenever communication is required.

The combination of sealed electronics and corrosion-resistant materials allows the telephone to remain in continuous service throughout the year, even in demanding outdoor and industrial environments.

Accessibility & Operational Reliability

Where hearing aid compatibility is required, the PT104-3B can be supplied with an optional inductive coupler.

*Note - Hearing aid symbol shown in product images for illustrative purposes only. Inductive coupler available on request at an additional cost.

For enhanced reliability, the telephone incorporates non-volatile memory that preserves programmed settings during power interruptions. This helps minimise maintenance while ensuring the telephone resumes normal operation without requiring reconfiguration following power restoration.

Features

• Heavy-Duty Push-to-Call Outdoor Phone
• Open Access Weatherproof Design
• Three Independently Programmable Stainless-Steel Push-to-Call Buttons
• Available with Analogue, SIP or GSM / 4G Connectivity
• Designed for Harsh Outdoor and Industrial Environments
• Available in Yellow, Blue, Red and Grey Finishes
• Handsfree High Quality Two-Way Voice Communication
• IP66 Weatherproof Protection
• IP67 Version Available on Request
• Corrosion-Resistant Die-Cast Aluminium Housing
• Industrial Epoxy Powder-Coated Finish
• Vandal-Resistant Construction
• Non-Volatile Memory
• Remote Configuration (Version Dependent)
• Optional Dry Contact Relay Outputs
• Lightning & Transient Protection (Analogue Version Only)
• Optional Inductive Coupler for Hearing Aid Compatibility
• MTBF Exceeding 50,000 Hours
• CE, FCC & RoHS Compliant

Specifications

Connectivity Options

Analogue Version

• Standard Analogue Telephone Line Connection
• Compatible with PSTN Networks
• Compatible with Analogue PABX Systems
• Push-to-Call Autodial Function
• Incoming Call Capability
• DTMF Remote Programming
• Internal Programming Keypad
• Powered Directly from Telephone Line
• MF (Tone) Dialling
• Lightning & Transient Protection to ITU-T K.21 Enhanced Levels

SIP Version

• SIP 2.0 (RFC3261) Compatible
• Supports Registration with Two SIP Servers
• WAN Port - 10/100Base-T RJ45 Auto MDIX
• LAN Port - 10/100Base-T RJ45 Auto MDIX
• Power Supply - PoE or Optional 12V DC PSU
• Web-Based Configuration Interface
• SIP Domain & Authentication Support
• DHCP Support, PPPoE Support, VLAN Support, STUN Support
• Bridge Mode Support
• Supports G.711 A-law / μ-law, G.722, G.723.1, G.726 & G.729 Codecs
• Acoustic Echo Cancellation (G.168)
• Full Duplex Voice Communication

GSM / 4G Version

• GSM / 4G Mobile Network Operation
• Micro SIM Card Support
• SMS Remote Programming
• SMS Remote Status Reporting
• 4G LTE FDD - B1 / B3 / B5 / B7 / B8 / B20
• LTE TDD - B38 / B40 / B41
• WCDMA - B1 / B5 / B8
• GSM - B3 / B8
• Power Input - 7.4V–12V DC
• Idle Current - 75mA
• Off-Hook Current - 160mA

Audio Features

• Handsfree Full Duplex Voice Communication
• High-Quality Two-Way Audio
• 80–90 dBA Ringing Volume (Version Dependent)

Construction

• Corrosion-Resistant Die-Cast Aluminium Housing
• Industrial Epoxy Powder-Coated Finish
• Three Stainless-Steel Push Buttons
• Open Access Front Panel Design
• Tamper-Resistant Mounting Bars
• Vandal-Resistant Construction

Protection Features

• IP66 Weatherproof Protection
• IP67 Available on Request
• EN60529 Compliant
• Lightning Protection (Analogue Version Only)
• Vandal-Resistant Design

Accessibility

• Optional Inductive Coupler for Hearing Aid Compatibility (Available on Request – Additional Charge Applies)

Environmental Specifications

• Operating Temperature: -30°C to +65°C
• Storage Temperature: -40°C to +75°C
• MTBF Exceeding 50,000 Hours

Compliance

• CE Certified
• FCC Compliant
• RoHS Compliant

Dimensions & Weight

• Dimensions - 204 × 334 × 74mm
• Gross Weight - 6kg

Package Contents

• Project Telecom PT104-3B 3 Button Push-to-Call Outdoor Phone with Open Access Front (Connectivity and Colour Option to be Selected at Checkout)
• Tamper-Resistant Mounting Hardware
• User Documentation