Akuvox 2-Wire and IP Intercom Range - Retrofit-friendly SIP door entry with keypad, RF reader and PoE options for apartment and office access control NZ

2-Wire vs IP Intercom: Which One Should You Choose?

Essential Security Supplies

Choosing between a 2-wire and IP intercom system usually comes down to the building's existing cabling, the required access features and how much flexibility the project needs in the future. Akuvox offers both approaches, including retrofit-friendly 2-wire systems and Ethernet-based IP door stations for new installations and networked access control.

This guide compares the two options for apartment buildings, offices, managed entrances and other professional security installations across New Zealand.

Start with the Existing Cable Infrastructure

The most important distinction is physical connection. In a 2-wire system, communication and power are delivered over a dedicated two-conductor connection between compatible devices. In an IP system, the door station connects to the network using Ethernet, commonly with Power over Ethernet or a separate DC supply.

AINTKPKit-2W Akuvox 2-Wire Intercom Kit - keypad doorphone and 7-inch indoor monitor for apartment entry

That means 2-wire does not automatically mean basic or analogue. The Akuvox R20K-2 is a 2-wire SIP video door phone with a 2 MP camera, keypad, RF card reader, IP65 protection and support for modern network protocols. The cabling method is different, but the system can still deliver networked video, SIP calling and access control.

What 2-wire means in the Akuvox range

The Akuvox R20K-2 uses a 48 V DC two-wire power supply and is designed for apartment and office building retrofits. Its matching indoor monitor, the C313W-2, includes two-wire ports, a 7-inch capacitive touchscreen, WiFi, relay output and multiple I/O connections.

This makes a 2-wire system worth considering where existing cabling is serviceable but replacing it with new Ethernet cable would create unnecessary disruption. It is still important to confirm cable condition, distance, topology and compatibility before specifying the equipment.

What IP means in the Akuvox range

An IP intercom uses Ethernet networking to connect the door station and indoor devices. The Akuvox R20K includes an RJ45 Ethernet port, 802.3af Power over Ethernet and a 12 V DC input if PoE is not used. It also supports SIP, video streaming and network management features.

IP systems can be a strong fit for new construction, commercial premises with structured cabling and projects that need straightforward integration with an existing network or hosted IP-PBX. They can also make it easier to distribute devices across a larger site, subject to the network design.

2-Wire vs IP: The Practical Differences

Consideration Akuvox 2-wire approach Akuvox IP approach
Best starting point Existing two-conductor intercom cabling, especially during apartment or villa retrofits. New Ethernet cabling, structured networks or premises already equipped for PoE.
Typical door station R20K-2, with 48 V DC two-wire supply, keypad, RF reader and IP65 protection. R20K, with RJ45 Ethernet, 802.3af PoE or 12 V DC supply, keypad and IP65 protection.
Indoor device C313W-2, with a 7-inch touchscreen, WiFi, two-wire ports and relay output. Use a compatible IP indoor monitor or SIP endpoint selected for the project architecture.
Installation disruption Can reduce the need to replace existing intercom cable, subject to a cable survey. May require new Ethernet runs where suitable network cabling is not already available.
Power delivery 48 V DC two-wire power supply on the R20K-2 system. PoE on the R20K, or 12 V DC where PoE is not used.
Network integration Still supports SIP and network protocols, but requires compatible 2-wire system components. Connects directly to an Ethernet network and is suited to SIP, IP-PBX and networked access designs.
Access control Keypad, RF card reading, Wiegand, RS485 and relay control on the R20K-2. Keypad, RF card reading, Wiegand, RS485 and two relays on the R20K.
Future expansion Best when the project follows the compatible 2-wire architecture and planned device limits. Often more flexible for networked endpoints and distributed commercial systems, provided the network is designed accordingly.

When an Akuvox 2-Wire Intercom Makes Sense

Akuvox 2-wire equipment is particularly useful when the project involves an existing intercom installation and the cabling is one of the main constraints. It can help installers modernise the door station and indoor monitor without automatically committing to a complete cable replacement.

  • Apartment or villa retrofits: Existing two-conductor cabling may be reusable after testing.
  • Occupied buildings: Reducing wall access and cable replacement can help limit disruption to residents and tenants.
  • Compact entry points: The R20K-2 provides keypad entry, card credentials and video in a compact outdoor-rated door station.
  • Projects needing video and access control: The system supports a camera, indoor monitor, relay control and credential options rather than audio-only entry.
  • Installations with limited cable pathways: Two-conductor wiring can be easier to reuse where new Ethernet routes are difficult to install.
R20K-2 Akuvox 2-Wire SIP Intercom - keypad and RF card reader for apartment retrofit access

The R20K-2 supports 13.56 MHz RF cards with NFC and 125 kHz credentials, as well as Wiegand and RS485 interfaces. Its 2 MP camera provides video up to 1080p, while the IP65 housing is suited to exposed entry locations when installed correctly.

When an Akuvox IP Intercom Makes Sense

An IP intercom is often the cleaner choice for a new build or a commercial site that already has structured Ethernet cabling. The Akuvox R20K connects through a 10/100 Mbps Ethernet port and can receive power through 802.3af PoE, which may simplify the connection between the communications cabinet and the door station.

R20K Akuvox IP SIP Intercom - PoE keypad door station for office access control
  • New construction: Ethernet cabling can be planned alongside other structured network services.
  • Commercial offices: SIP and IP-PBX compatibility can support a broader communications system.
  • Networked access control: IP architecture can suit projects with multiple connected entry points and managed devices.
  • PoE requirements: The R20K can use 802.3af PoE, helping combine data and power over the Ethernet connection.
  • Higher expansion expectations: IP is worth considering when future devices, integrations or distributed locations are likely to be added.

The R20K supports SIP v1 and SIP v2, with video codecs including H.265 and H.264. For background on the Session Initiation Protocol used by many IP communication systems, see the IETF SIP specification, RFC 3261.

Do Not Choose on Cabling Alone

The right system is not determined only by whether the building has two wires or Ethernet. The entry method, indoor device, power arrangement, integration requirements and expected future changes also matter.

Project question Why it matters
What cable is installed? Confirm the number of conductors, cable condition, route, distance and whether the cable is shared with other services.
How many entry points are required? Single-door residential projects and larger commercial sites may need different architectures and expansion plans.
Is keypad or card access required? Confirm the credential type, reader frequency, relay requirements and whether Wiegand or RS485 integration is needed.
Is remote or hosted calling required? SIP, IP-PBX, network routing and firewall requirements should be confirmed before equipment is selected.
Where will power be provided? 2-wire and PoE designs use different power arrangements. Confirm the supply, switch capacity and any required converters.
What are the environmental conditions? Check IP rating, temperature range, mounting method, rain exposure and the need for a hood or protective installation.

Product Specifications

The following specifications are based on the current product descriptions for the selected active Akuvox products in the Essential Security Supplies catalogue.

Specification Detail
2-wire door station R20K-2, compact SIP video door phone with aluminium alloy front panel, numeric keypad, RF card reader, one relay and one input.
2-wire power supply R20K-2 uses a 48 V DC two-wire power supply.
2-wire camera and video R20K-2 has a 2 MP camera, 110° horizontal and 58° vertical viewing angle, H.264 video and resolution up to 1920 x 1080p.
2-wire access credentials R20K-2 supports a numeric keypad, 13.56 MHz RF cards with NFC, 125 kHz credentials, Wiegand and RS485.
2-wire environmental rating R20K-2 is rated IP65 and operates from -30°C to +60°C. Flush dimensions are 226 x 108 x 52 mm, with wall-mounted dimensions of 185 x 85 x 29 mm.
2-wire indoor monitor C313W-2 has a 7-inch capacitive touchscreen with 800 x 480 resolution, 2.4 GHz WiFi, two-wire ports, one relay, eight I/O and a 10/100 Mbps Ethernet port.
2-wire monitor installation C313W-2 supports wall-mounted or desktop installation and measures 200.2 x 132.2 x 27.2 mm. Operating temperature is -10°C to +45°C.
IP door station R20K, compact SIP video doorphone with aluminium alloy front panel, numeric keypad, RF card reader, two relays and two inputs.
IP power and network R20K supports RJ45 10/100 Mbps Ethernet, 802.3af PoE and 12 V DC when PoE is not used.
IP camera and video R20K has a 2 MP camera, 110° horizontal and 58° vertical viewing angle, H.265 and H.264 video, and resolution up to 1080p.
IP access credentials R20K supports a numeric keypad, 13.56 MHz and 125 kHz RF card reading, Wiegand and RS485.
IP environmental rating R20K is rated IP65 and operates from -30°C to +65°C. Flush dimensions are 226 x 108 x 52 mm, with wall-mounted dimensions of 185 x 85 x 29 mm.
Complete 2-wire kit AINTKPKit-2W includes an R20K-2 doorphone and a 7-inch indoor monitor. The E12S-2/C313W-2 kit is another active Akuvox 2-wire kit option listed for retrofit applications.

For full model-specific information, view the View our product for R20K-2, View our product for R20K, View our product for C313W-2, or View our product for the AINTKPKit-2W.

C313W-2 Akuvox 2-Wire Indoor Monitor - 7-inch WiFi touchscreen for apartment retrofit

How to Choose the Right Akuvox System

Choose 2-wire when the project is retrofit-led

Select an Akuvox 2-wire solution when the existing cable is usable, the project needs to minimise disruption and the required entry functions can be delivered through the compatible 2-wire architecture. The R20K-2 and C313W-2 combination is particularly relevant to apartment, villa and office retrofit work.

Choose IP when the project is network-led

Select an IP solution when Ethernet cabling is already available or can be installed as part of the project. The R20K is a better starting point where PoE, direct network connection, SIP integration or future networked expansion are central to the specification.

Confirm the system before ordering

Before finalising the equipment, confirm the existing cable type, route, distance, power supply, indoor monitor compatibility, access credentials, number of doors and network requirements. A 2-wire system can be the smarter retrofit option, but only when the cable and system architecture are suitable. An IP system can offer excellent flexibility, but only when the network is designed and supported for the required devices.

Final Recommendation for New Zealand Installers

For an apartment or office retrofit where replacing cable would be disruptive, start by assessing the Akuvox 2-wire range, including the R20K-2, C313W-2 and AINTKPKit-2W. For new construction, structured Ethernet projects or sites that need PoE and direct network integration, the Akuvox R20K IP door station is the more natural starting point.

Neither option is automatically better for every building. The best choice is the one that matches the cable infrastructure, access control requirements, environmental conditions and future expansion plan. For a project-specific recommendation, provide the number of doors, existing cable type, approximate cable distances, required credentials and whether SIP or PoE integration is needed.