Cisco VIC3-4FXO/DID Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 4-Port Generation 3 Dual-Mode FXO/DID Voice Interface Card
Spare SKU:VIC3-4FXO/DID=
Naming Breakdown
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VIC3: Voice Interface Card, Generation 3
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4: Four independent software-configurable RJ-11 analog trunk ports
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FXO/DID: Mutually exclusive Foreign Exchange Office trunk mode / Direct Inward Dial trunk mode
Core Product Positioning
The Cisco VIC3-4FXO/DID is a third-generation pluggable analog voice mezzanine daughterboard designed for Cisco multiservice Integrated Services Routers. Each port can be individually configured to operate in FXO bidirectional trunk mode or inbound-only DID trunk mode. FXO mode connects to PSTN central office circuits or legacy PBX analog trunks for two-way voice calling. DID mode receives dialed digits from carrier DID trunks to route incoming calls directly to internal extensions. This flexible multi-trunk voice card supports medium-density branch VoIP gateways, Survivable Remote Site Telephony (SRST), Cisco Unified Communications Manager Express (CUCME), toll bypass, emergency E911 connectivity and hybrid TDM-to-IP telephony migration.
2. Hardware Compatibility & Supported IOS Releases
Supported Host Platforms
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Cisco 2800 Series: 2801, 2811, 2821, 2851
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Cisco 3800 Series: 3825, 3845
Must be installed inside compatible voice network modules: NM-HD-1V, NM-HD-2V, NM-HD-2VE, NM-HDV2
Unsupported Platforms
2600XM, 3700 Series, ISR 2900/3900 G2 (requires dedicated adapter), ISR 4000 Series, Catalyst switching platforms
Minimum Supported IOS Version
IOS 12.4(15)XZ; Validated stable releases: 12.4T, 15.0M, 15.1M, 15.2(4)M
3. Physical & Electrical Specifications
Form Factor
VIC mezzanine daughterboard;non-hot-swappable. A full router power cycle is required for installation and removal.
Interfaces
4 × RJ-11 universal dual-mode FXO/DID analog trunk ports
Analog Line Characteristics
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Accepts -48V DC battery feed, dial tone and AC ringing signals from PSTN or PBX analog trunks
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Supports loop-start and ground-start analog signaling
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Inbound Caller ID detection
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CPC call disconnect supervision and battery reversal detection
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Supports CAMA trunk signaling for North American E911 emergency services
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Software programmable regional telephony profiles for global deployment
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Receives inbound dialed digits from service provider DID trunk circuits
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Inbound-only functionality; cannot initiate outbound calls
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Does not supply ring voltage or DC battery power
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Caller ID detection is unavailable in DID mode
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Supports wink-start, immediate-start and delay-dial DID signaling variants
Typical Power Consumption
Environmental Operating Parameters
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Operating Temperature: 0°C to 40°C (32°F – 104°F)
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Storage Temperature: -40°C to 70°C (-40°F – 158°F)
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Relative Humidity: 5% – 85% non-condensing
4. Supported Features & Functional Capabilities
Voice & Fax Services
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Analog PSTN trunk termination for Voice over IP (VoIP) gateway routing
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T.38 Fax Relay, Fax Passthrough and Modem Passthrough
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ITU-T compliant acoustic echo cancellation, Voice Activity Detection (VAD), Comfort Noise Generation (CNG)
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Dynamic jitter buffer management (DSP resources must be provisioned on the host voice network module)
Unified Communications Features
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Survivable Remote Site Telephony (SRST) for uninterrupted PSTN emergency access during WAN outages
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Cisco Unified Communications Manager Express (CUCME)
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DID digit routing enabling direct inbound PSTN dialing to enterprise internal extensions
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Toll bypass voice routing to reduce enterprise long-distance PSTN communication costs
QoS & Transport Interoperability
Integrates with Cisco IOS QoS mechanisms including Low Latency Queueing (LLQ) and RSVP to prioritize real-time voice traffic over IP, Frame Relay and ATM WAN infrastructures.
Management & Diagnostics
Complete configuration, monitoring and troubleshooting via Cisco IOS CLI
Voice port loopback testing, real-time voice call debugging, event logging via Syslog and SNMP v1/v2c/v3
5. Typical Enterprise Deployment Scenarios
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Medium-density branch VoIP gateway mixing bidirectional FXO PSTN trunks and dedicated inbound DID trunk circuits
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SRST/CUCME deployments providing resilient PSTN connectivity and direct DID inbound call routing
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Hybrid telephony migration connecting IP voice gateways to legacy analog PBX trunk ports
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Regional office multi-line analog fax trunk services over PSTN with DID inbound support
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Enterprise branch gateway deployments requiring flexible port assignment between general FXO trunks and DID services
6. Regulatory & Compliance Certifications
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Safety Standards: UL 60950-1, CSA C22.2 No.60950-1, IEC/EN 60950-1
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EMC Compliance: CE Mark, FCC Part 15 Class A, ICES-003 Class A, VCCI Class A
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Environmental Directives: EU RoHS 2.0 compliant, WEEE compliant
7. Standard Factory Package Contents
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Cisco VIC3-4FXO/DID 4-Port Generation 3 FXO/DID Voice Interface Card
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Hardware installation guide
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Safety and regulatory documentation
End-of-Life Status
The VIC3 voice interface card family has reached Cisco End-of-Sale (EoS). New original hardware manufacturing has been discontinued with limited software maintenance support. Recommended migration: EHWIC-VA series analog voice modules for ISR Generation 2 routers.
UNSPSC Classification Code
43222608 – Cisco VIC3-4FXO/DID 4-Port Generation 3 Dual-Mode FXO/DID Voice Interface Card for Cisco 2800/3800 multiservice Integrated Services Routers, delivering software-selectable bidirectional PSTN FXO trunks and inbound-only DID trunk interfaces for medium-density branch VoIP gateway, emergency E911 and hybrid unified communications deployments.
Hardware Warranty
Brand-new original modules carry a 1-year limited Cisco factory warranty covering manufacturing defects. Warranty terms for refurbished hardware follow reseller contractual agreements.
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