VIC3-4FXS/DID Cisco 4-port FXS/DID Voice/Fax Interface Card

Cisco VIC3-4FXS/DID - Four-Port Voice Interface Card (FXS/DID)

The Cisco VIC3-4FXS/DID is a high-density voice interface card that provides four analog ports supporting Foreign Exchange Station (FXS) and Direct Inward Dialing (DID). Designed for Cisco Integrated Services Routers, it enables seamless integration of analog telephony devices such as phones, fax machines, and key systems into IP-based networks. This module is ideal for enterprises and branch offices requiring reliable analog voice connectivity alongside digital services.

🔧 Key Specifications

• Device Type: Voice/Fax Interface Card
• Analog Ports: 4 (FXS/DID, RJ11)
• Connectivity: Wired analog telephony integration
• Compatible Platforms: Cisco 2800, 2900, 3800, 3900 Series ISR routers
• Supported Interfaces: 4x RJ11 (FXS/DID)
• Standards Compliance: FCC Class B, UL 1950 certified
• Operating System Requirement: Cisco IOS 12.4(15)XZ or later
• Functions: Provides ringing voltage, dial tone, battery polarity reversal, and caller ID
• DID Support: Enables incoming call connectivity from the PSTN central office
• Form Factor: Internal router expansion slot

🧩 Ideal Use Cases

• Connecting multiple analog phones and fax machines to Cisco ISR routers
• Branch office telephony integration with IP networks
• Enterprises requiring DID connectivity for incoming calls
• Hybrid environments combining analog and digital voice services

⚙️ Licensing & Expansion
The VIC3-4FXS/DID operates as a plug-in module for supported Cisco ISR platforms. No additional licensing is required beyond standard Cisco IOS support. Expansion is achieved by adding multiple VIC modules to increase analog port density.