General
Type of device	VoIP Gateway
ISDN connection	2 BRI TE/NT
Voice/fax connections	4
TLS/SRTP support	Optional
Ethernet connection	1x Gigabit
Voltage range	100–240 VAC
Operating system	Trinity
SIP support
High Precision Clock

The Patton SmartNode ISDN BRI VoIP Gateway, type SN4131/2BIS4VHP/EUI, is a network device for integrating ISDN basic rate interface (BRI) into IP-based telephony and fax systems. It serves as a bridge between traditional ISDN connections and modern VoIP networks, enabling the conversion of analog or digital voice and fax signals into IP packets. The device is designed for use in corporate and communication infrastructures requiring a secure and reliable connection between ISDN and IP networks.

Applications
This gateway is suitable for companies that have existing ISDN connections and wish to connect them to an IP telephony system. It supports up to four simultaneous voice or fax connections over two BRI ports, making it appropriate for small to medium offices or locations with limited connection requirements. Typical use is in hybrid networks where ISDN and IP technologies are operated in parallel. The High Precision Clock (HPC) ensures precise time synchronization, which is particularly important for network synchronization or avoiding delays in voice transmission.

Functions and Equipment in Detail
The device features two BRI ports, which can be operated in either Terminal Equipment (TE) or Network Terminator (NT) mode. This allows flexible connection to various ISDN infrastructures, whether to an ISDN connection from telecommunications providers or to an internal ISDN network. Support for up to four simultaneous voice or fax connections per device makes it a powerful solution for voice communication. Optionally, the gateway can be equipped with TLS and SRTP support, enabling encryption of voice data over SIP.

Technology Explained Simply
The gateway uses the Trinity software platform as its operating system, responsible for controlling and configuring network functions. The integrated High Precision Clock ensures high accuracy in time synchronization, which is critical for synchronizing network elements and avoiding voice delays. The device includes a Gigabit Ethernet port, enabling fast and stable connection to the IP network. Power supply is provided via an external power adapter designed for voltage ranges of 100–240 VAC, making it suitable for use in Europe (EU) and North America (NA). The external power supply is included in the delivery scope.

Compatibility and Accessories
The gateway is compatible with SIP-based IP telephony systems and can be integrated into existing VoIP infrastructures. Support for TLS and SRTP (optional) enables secure communication, especially in environments where data privacy and data integrity are of high importance. The exact encryption configuration is performed via the SNSW-SIP-TLS model, available as an additional module.

Mounting and Installation
Installation is carried out via connections to ISDN BRI ports and the Gigabit Ethernet interface. Configuration of network and ISDN settings is performed through the Trinity software platform, accessible via a web interface or command-line interface. The external power supply is connected to a suitable power outlet. Mounting is done in a standard 19-inch rack, with the device featuring appropriate mounting holes. The detailed mounting instructions are part of the user manual, available on the manufacturer’s website.

Advantages in Operation
The gateway enables seamless integration of ISDN and IP networks, allowing existing investments in ISDN infrastructure to be preserved while simultaneously benefiting from IP telephony advantages. Support for up to four simultaneous connections and the High Precision Clock ensure stable and reliable communication. The external power supply for worldwide use and compatibility with SIP systems increase the flexibility and application possibilities of the device. The warranty period is two years, indicating the product’s reliability.