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FXO ports worked reliably for PSTN connectivity.
EM2-HDA-4FXO
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4-port voice/fax expansion module - FXO Cisco Router Network...
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Name:
EM2-HDA-4FXO
- Description:
- 4-port voice/fax expansion module - FXO Cisco Router Network Module
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 610585725931
- Condition:
- Warranty:
- 3
- List Price:
$1,000.00
- Price:
$481.0051.9% off
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1
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EM2-HDA-4FXO Overview
EM2-HDA-4FXO is a high-performance WAN module built to integrate four FXO analog telephony ports into modern network infrastructures. Designed specifically for routers, gateways, and PBX systems, this module supports vital voice protocols such as SIP and SS7, ensuring reliable call conversion between traditional PSTN and VoIP networks without compromise on stability or clarity.
Engineered with a modular form factor and featuring standard RJ-11 connectors, the EM2-HDA-4FXO easily fits into a variety of hardware platforms from industry-leading vendors. Its robust design, optimized for installation in environments like call centers and enterprise telephony systems, delivers essential features such as echo cancellation and caller ID support while maintaining seamless compatibility with platforms from Cisco, Juniper, and Dell.
EM2-HDA-4FXO price is $481.00, a 51.9% saving from the Cisco list price of $1,000.00. EM2-HDA-4FXO is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for EM2-HDA-4FXO for additional pricing. Browse the full Nm Nme Em Network Modules series or explore all Cisco products.
EM2-HDA-4FXO Specifications
- Power Consumption
- N/A
- Weight
- N/A
- Height
- N/A
- Depth
- N/A
- Width
- N/A
- Expansion Slots
- NIM
- Form Factor
- Modular
- Data Rate
- N/A
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 3.3V
- Connector Type
- RJ-11
- Max Speed
- N/A
- Interface Ports
- FXO
- Product Type
- WAN Module
- Compatibility
- Cisco / Juniper / Dell
- Module Type
- FXO Analog Telephony
- Supported Protocols
- SIP / SS7
- Supported Features
- Echo Cancellation / Caller ID / Call Waiting
- Product Name
- EM2-HDA-4FXO
EM2-HDA-4FXO Use Case
Remote Branch PSTN Integration for Unified Voice and Fax
A finance company deploys the EM2-HDA-4FXO-4-port module in regional offices to connect local PSTN lines directly into its centralized Cisco UC platform. This setup ensures uninterrupted voice calls and legacy fax services over a single WAN link, reducing per-site TCO by 30% while maintaining SLA-grade uptime and simplified centralized management.
Disaster-Recovery Fax Continuity for Regulated Industries
A healthcare provider adds the EM2-HDA-4FXO-4-port module to its primary Cisco router as a hot-standby voice/fax gateway. In case of IP WAN failure, inbound and outbound fax traffic automatically reroutes over PSTN via FXO ports, ensuring HIPAA-compliant document delivery with zero data loss and immediate failover in under 3 seconds.
Cost-Optimized Toll Bypass for Retail Chain Call Centers
A nationwide retail chain integrates the EM2-HDA-4FXO-4-port module with its Cisco ISR routers at regional call centers, enabling local FXO trunks for high-volume inbound customer calls. This toll-bypass architecture cuts international and long-distance charges by up to 45%, preserves voice quality through hardware DSP offload, and scales seamlessly across 50+ locations.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| EM2-HDA-4FXO |  NM-8CE1T1-PRI |  NM-1A-OC3-POM |  NME-APPRE-502-K9 |  NME-VMSS-HP32 | |
|---|---|---|---|---|---|
| Product Type | WAN Module | Network Module | Network Module | Network Card | Network Module / Network Card |
| Module Type | FXO Analog Telephony | Ethernet Module | WAN Module | Ethernet | Ethernet |
| Data Rate | N/A | 10Gbps | N/A | 10Gbps | 10G |
| Connector Type | RJ-11 | SFP+ | SFP | SFP+ | SFP+ |
| Supported Protocols | SIP / SS7 | TCP/IP | TCP/IP | TCP/IP, iSCSI | TCP/IP / iSCSI |
| Form Factor | Modular | PCIe | Modular | PCIe | PCIe |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Input Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Compatibility | Cisco / Juniper / Dell | Cisco, Juniper, Arista, Dell, HP | Cisco, Juniper, Arista, Dell, HP | Cisco, Juniper, Dell, HP | Cisco / Juniper / Arista / Dell / HP |
| Max Speed | N/A | 10Gbps | N/A | 10Gbps | 10Gbps |
| Supported Features | Echo Cancellation / Caller ID / Call Waiting | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | N/A | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Auto-negotiation / Wake-on-LAN / Jumbo Frames / QoS |
| Power Consumption | N/A | 15W | N/A | 12W | 15W |
| Interface Ports | FXO | SFP+ | SFP | SFP+ | Ethernet |
| Expansion Slots | NIM | N/A | N/A | N/A | PCIe |
| Product Name | EM2-HDA-4FXO | NM-8CE1T1-PRI High-Speed Ethernet Module | NM-1A-OC3-POM | NME-APPRE-502-K9 | NME-VMSS-HP32 |
| Height | N/A | 1.0 inches | N/A | N/A | 1.73 inches |
| Width | N/A | 5.0 inches | N/A | N/A | 3.5 inches |
| Depth | N/A | 7.0 inches | N/A | N/A | 0.9 inches |
| Weight | N/A | 1.8 lbs | N/A | N/A | 1.2 lbs |
Reviews & Ratings
N
Noreen Akhtar
5
Clear voice quality and easy integration.
I
Ivan Petrov
5
Solid expansion module for voice deployments.
C
Cheryl Adams
5
No issues during installation or use.
S
Sajid Malik
5
Dependable performance so far.
Questions & Answers
What is the Cisco EM2-HDA-4FXO module?
The Cisco EM2-HDA-4FXO is a 4-port FXO voice/fax expansion module designed for Cisco ISR and ASR routers. It enables PSTN connectivity via analog lines for voice, fax, and modem traffic.
How many FXO ports does this module provide?
The EM2-HDA-4FXO provides four FXO ports, allowing simultaneous connection of up to four analog PSTN lines.
Which Cisco routers are compatible with the EM2-HDA-4FXO?
Compatible platforms include Cisco ISR 4000 Series and select ASR 1000 Series routers with an EM2 high-density expansion slot.
What are the primary use cases for the EM2-HDA-4FXO?
Ideal for branch offices, remote sites, and failover scenarios, the module enables PSTN integration, fax backup, and analog line connectivity alongside VoIP.
Does the EM2-HDA-4FXO support fax transmission?
Yes. The module supports fax transmission via T.38 and G.711 pass-through protocols for reliable fax over IP.
What voice codecs does the EM2-HDA-4FXO support?
Supported voice codecs include G.711 μ-law and A-law, G.729a, and T.38 for fax; codec conversion is handled by the router’s DSP resources.
Is the EM2-HDA-4FXO hot-swappable?
Yes. The module supports hot-swapping, allowing installation or replacement without powering down the router.
What is the power consumption of this module?
Typical power consumption is approximately 5.5 W at full load. Actual consumption varies with call volume and DSP utilization.
What firmware version is required for the EM2-HDA-4FXO?
This module requires Cisco IOS XE release 16.6.3 or later. Verify compatibility on Cisco’s Compatibility Matrix before deployment.
How do I install the EM2-HDA-4FXO module?
Install by inserting the module into an empty EM2 slot, securing it with screws, powering on the router, and verifying detection via the 'show inventory' command.
How do I configure dial-peers for the EM2-HDA-4FXO?
Define voice class, specify FXO interfaces (e.g., 'port 0/2/0'), and map PSTN patterns. Use 'dial-peer voice 1 pots' and 'port 0/2/0' in global configuration.
Does Cisco offer warranty and support for this module?
Cisco provides a one-year limited hardware warranty, with optional SMARTnet services for extended support, software updates, and advance hardware replacement.
What troubleshooting steps are recommended for FXO issues?
Verify line voltage, check 'show voice port summary', enable debug on the voice port, confirm dial-peer matches, and inspect cable integrity.
What is the maximum call capacity on the EM2-HDA-4FXO?
Each FXO port supports one simultaneous PSTN call; total capacity is four concurrent calls per module.
Where can I purchase genuine EM2-HDA-4FXO modules?
Purchase through authorized Cisco partners, resellers, or the Cisco online store. Ensure SKU EM2-HDA-4FXO is supplied by a certified distributor.
Can I route PSTN calls through VoIP providers with this module?
Yes. When configured with SIP or H.323 gateways on the router, the module routes analog PSTN calls to VoIP providers via SIP trunking.