Image Alt


The Audiotrix C2 is a VoIP Analog Adaptor that interconnects analog telephones, faxes, and modems into SIP based systems. This ATA allows operators to shorten deployment time and ensure a highly secure environment to enable cloud telephony services into branch offices and SMBs.

Technical Specifications

Session Border Controller

G.711 (A-law and μ-law), G.729a/b

G.168 echo cancellation

DTMF detection and generation

Silence detection/suppression and comfort noise

Configurable de-jitter buffer and packet length

Analog Telephony

Support for: call forward

Support for: call transfer

Support for: conference call

Support for: call waiting

Multiple country presets

Multiple country presets

Customizable tones and ring patterns

Echo cancellation

Message Waiting Indication (MWI), via FSK

On-hook/off-hook caller ID generation

Fax and Modem Support

RealtimeT.38 fax

Clear channel (G.711) fax and modem pass-through

Power Supply

External 100-240 VAC power supply

Physical Interfaces

3 x 10/100 Base-T Ethernet RJ-45 connectors

2 x RJ-11 FXS connectors

IP Telephony Protocol

SIP (RFC 3261) over: UDP



RTP (RFC 3550)

SDP (RFC 4566)

Redundancy support via DNS SRV

IPv4 and IPv6 dual stack


Zero-touch provisioning




Scripts/firmware files

Syslog, log file


IPv4 – IPv6

DHCP client

PPPoE (RFC 2516)

QoS traffic shaping


Static routing


DHCP Server

Operating Environment

Operating temperature: 0ºC to 50ºC

Storage temperature: -25ºC to 85ºC

Humidity: up to 85%, non-condensing


Height: 3.2 cm approx.

Width: 8.0 cm approx.

Depth: 12.0 cm approx.

Weight: 120 g

Key Features

Data Network

WAN: 1 x 10/100Mbps Ethernet port
LAN: 2 x 10/100MBps Ethernet ports

Robust Security

Encrypted media, signaling, and management
Deep packet inspection firewall with DoS protection

Easy Configuration and Management

Zero-Touch configuration
Intuitive Web GUI
Customisable factory settings


Multiple IP addresses and VLANs
NAT, firewall, and router capabilities


Interconnect any device to SIP

The Audiotrix C2 links any analog connection to an IP network and delivers a rich feature set for a comprehensive VoIP solution.

Highly reliable Fax and Modem

Transmissions over IP With T.38 and clear channel fax and modem pass-through capabilities, the Audiotrix C2 ensures seamless transport of voice and data services over IP networks.

Legacy PBX system gateway

With FXS ports, local call switching, and userdefined call properties (including caller/calling ID), the Audiotrix C2 integrates into legacy PBXs.

VPN client/server

The Audiotrix C2 features new firmware, offering advanced networking features, set and use the VPN client/server accordingly toyour corporate requirements.

Access our Documentation Portal and get in touch with our integration experts for more information.