VG400-2FXS/2FXO Cisco VG400 Analog Voice Gateway with 2 FXS and 2 FXO

The VG400-2FXS/2FXO CISCO Voice Gateway is a compact, enterprise-grade analog voice gateway designed to bridge traditional analog telephony with modern IP-based voice networks. Built for reliability, voice quality, and ease of deployment, this gateway is ideal for organizations migrating to VoIP while retaining analog phones, fax machines, modems, or PSTN lines. As part of the Cisco VG400 Series, it delivers proven Cisco voice technology in a small, cost-effective footprint—perfect for branch offices, retail locations, and distributed enterprise environments.

Overview of the Cisco VG400-2FXS/2FXO Voice Gateway

The gateway model features two FXS ports for connecting analog endpoints such as phones and fax machines, and two FXO ports for connecting to PSTN lines. This balanced port configuration enables flexible call routing, survivability, and gradual VoIP migration without disrupting existing telephony infrastructure.

Designed to integrate seamlessly with Cisco Unified Communications solutions, the gateway supports SIP-based call control and advanced voice features. Whether you are deploying a new IP telephony system or upgrading a legacy PBX environment, the voice gateway ensures smooth interoperability and consistent call performance.

Key Benefits of VG400-2FXS/2FXO

Seamless Analog-to-IP Integration

The gateway allows businesses to continue using analog devices while transitioning to IP telephony. This protects existing investments and minimizes downtime during migration.

High-Quality Voice Performance

Cisco’s voice processing technology ensures clear audio, low latency, and reliable call handling—critical for customer-facing and operational communications.

Compact and Branch-Friendly Design

With small VG400-2FXS/2FXO Dimensions and manageable VG400-2FXS/2FXO Weight, the device fits easily into space-constrained environments such as retail stores or remote offices.

Enterprise-Grade Reliability

Built on Cisco’s trusted hardware platform, the gateway delivers long-term stability, secure communications, and consistent uptime.

Port Configuration and Connectivity

FXS Ports (2)

The two FXS ports connect analog endpoints such as telephones, fax machines, and analog paging systems. These ports provide battery power, dial tone, and ringing voltage, enabling full-featured analog device support.

FXO Ports (2)

The two FXO ports connect directly to PSTN lines from a local service provider. This allows inbound and outbound calls through the public telephone network and supports fallback calling during IP network outages.

Ethernet Connectivity

The gateway includes Ethernet interfaces for IP network connectivity, enabling SIP-based integration with IP PBXs and unified communications platforms.

VG400-2FXS/2FXO Technical Specifications

Below are key specifications commonly referenced from the VG400-2FXS/2FXO Datasheet, making it easier for buyers and IT teams to evaluate fit and performance:

• Model: VG400-2FXS/2FXO Cisco VG400 Analog Voice Gateway
• Analog Ports: 2 × FXS, 2 × FXO
• Call Control Protocol: SIP
• Voice Codec Support: G.711, G.729, and other industry-standard codecs
• Echo Cancellation: Hardware-based echo cancellation for improved call clarity
• Network Interfaces: Ethernet LAN ports for IP connectivity
• Power Supply: External power adapter
• VG400-2FXS/2FXO Dimensions: Compact desktop form factor suitable for branch deployments
• VG400-2FXS/2FXO Weight: Lightweight design for easy installation and mounting
• Operating Environment: Designed for enterprise and commercial use

These specifications make the VG400-2FXS/2FXO an excellent choice for organizations seeking a reliable analog gateway with modern VoIP capabilities.

Deployment and Installation Considerations

The VG400-2FXS/2FXO Installation Guide is structured to support fast and straightforward deployment. Installation typically involves connecting analog devices to the FXS ports, PSTN lines to the FXO ports, and the Ethernet interface to the IP network. Configuration is performed through Cisco-supported interfaces, allowing administrators to define SIP settings, dial plans, and routing rules.

The compact size and low weight simplify placement on desks, shelves, or wall mounts, making it ideal for locations without dedicated telecom racks.

Use Cases and Applications

Branch Office Telephony

Enable VoIP connectivity while supporting local analog phones and PSTN access.

Retail and Hospitality

Support fax machines, analog phones, and emergency lines with reliable call routing.

Migration from Legacy PBX

Gradually transition from analog PBX systems to IP-based communications without replacing all devices at once.

Network Survivability

Maintain PSTN calling capability during IP network outages using FXO ports.

Why Choose the VG400-2FXS/2FXO Cisco Voice Gateway

The VG400-2FXS/2FXO CISCO Voice Gateway stands out for its balance of flexibility, performance, and enterprise-grade reliability. Backed by Cisco’s expertise in voice networking, it provides a dependable foundation for hybrid analog and IP telephony environments. Its thoughtful design, practical port mix, and compact footprint make it a smart investment for businesses focused on scalable and future-ready communications.

Frequently Asked Questions

What is the purpose of the VG400-2FXS/2FXO Cisco Voice Gateway?
It connects analog phones and PSTN lines to IP-based voice networks, enabling hybrid analog and VoIP deployments.

How many analog devices can I connect to this gateway?
You can connect up to two analog devices using the FXS ports and up to two PSTN lines using the FXO ports.

Is the VG400-2FXS/2FXO suitable for small offices?
Yes, its compact dimensions and lightweight design make it ideal for small offices and branch locations.

Does the gateway support VoIP standards?
Yes, it supports SIP and industry-standard voice codecs, as outlined in the VG400-2FXS/2FXO Datasheet.

Where can I find setup instructions for this device?
Configuration and deployment details are provided in the official VG400-2FXS/2FXO Installation Guide, designed for quick and efficient setup.

If you want, I can also tailor this page for a specific buyer persona (IT managers, telecom resellers, or SMB owners) or expand it with a comparison against other VG400 models.