IP Intercom FAQs

The NX1 and NX250 connect via Ethernet and also have 4G capability built in as standard. If you use the 4G connection, you’ll need a 4G data SIM with a stable connection.

• Built-in support for both Ethernet and 4G
• Simple setup using the Commtel CONFIG app
• Remote firmware updates and intelligent APN learning
• Powerful, programmable relay functions
• Public holiday-aware time profiles
• Local fallback for access control in case of network failure

You can find out more about the NX1’s features here!

Unlike Vision, which uses separate audio and video pathways, the NX1 and NX250 handle audio and video over the same IP connection. Users can receive calls, grant access and manage the system through the Commtel NEXUS app.

In a network failure, the NX1 and NX250 retains:

• PIN access
• Time profiles and trade entry
• Local relay control
  Only calls and video are impacted. Once the connection returns, the system automatically re-syncs data to the cloud.

The NX1 and NX250 don’t include battery backup. If the site requires additional resilience, installers can fit an external PSU.

Yes, this is recommended. If the Ethernet connection fails, the system can instantly switch to 4G data.

• 4G: Minimum -85 dBm for reliable performance.

• Upload speed: At least 1.5 Mbps (4G or Ethernet) to support video calling.

SIP allows the NX1 and NX250 to make and receive standard phone calls over the internet.

With a SIP subscription, you can:

• Use dial-to-open. Add an authorised phone number to the system’s whitelist and the intercom can recognise the incoming call and activate the relay.
• Receive standard phone calls. When someone presses the call button, the intercom can call a mobile or landline instead of making a NEXUS video call.

SIP functionality is built into the NX1 and NX250, but you’ll need a separate subscription to use it. You can manage the subscription through the Commtel NEXUS app.

SIP subscriptions are £5 + VAT per month or £60 + VAT per year.

Yes. Either your phone (for the app) or a SIP line (for standard calls) must be internet-connected.

Installers can download the NX1 install guide here: NX1 Overview – Commtel Ltd. Please note you must be logged into your account to do this.

No, unlike some IP intercoms, the NX range does not require any firewall port configuration when connected via Ethernet, making installation simpler and more secure.

No. Installers already familiar with Commtel’s 4G products will recognise much of the setup and programming process.

The NX1 and NX250 feature three relays:

• 1x 2A relay – Configurable as normally open (N/O) or normally closed (N/C) by default.
• 2x 200mA relays – Normally open (N/O) by default but fully programmable via the app.

Each relay is customisable, allowing you to latch, unlatch, toggle, or pulse based on your specific needs.

Installers will need permission from the admin (homeowner/site manager) to reprogram the device after 30 days from handover. The admin can grant access via the Commtel NEXUS app, or the installer can request it through the Commtel CONFIG app, ensuring end-user privacy and control.

The NX1 is designed for single-point entry (e.g. private homes, offices, barriers). However, we do have the NX250 which is suitable for larger multi-user sites. You can find more information about the NX250, here.

Not simultaneously, but it supports:

• Call diverting to backup contacts
• Multiple PIN users and dial-to-open (with SIP)

 The NX250 can call up to 250 users, making it suitable for larger or multi-user sites.

The Commtel NEXUS app enables:

• Live video call answering
• PIN and access management
• Temporary and scheduled codes
• Installer access control
• Relay control settings
• User management

Via the Commtel NEXUS app:

• Receive video calls
• Grant access
• Configure PINs and relays
• Manage user permissions

Yes! The Commtel NEXUS app can be installed on tablets, giving users the same control and visibility as on a smartphone.

• Ethernet only: No ongoing costs

• Using Commtel 4G SIM: £7.50 + VAT/month

• SIP features: £5 + VAT/month or £60 + VAT/year

All Commtel products come with a two-year return-to-manufacturer warranty. This covers internal parts and Commtel labour in the event of a manufacturing fault.

Yes, spare parts are available for all current Commtel intercoms, including the NX1 and NX250. These are available for our Installers and Distributors to purchase when logged into our website, or by contacting our sales team directly on 01306 710 120 (option 2) or by emailing sales@commtel.io.

• Data hosted on secure Google and AWS cloud servers with 99.99% uptime.
• End-to-end encryption for app-based calls.
• Local data storage to maintain access control during outages.

The system manages firmware updates remotely and installs them automatically, ensuring your system is always up to date with the latest features and fixes.