United States$5,000,000+
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B
Benjamin Wells
5
72FXS voice service module provides stable high-density analog voice integration.
SM-X-72FXS
Original Stock
Ready to Ship
Fixed Port High Density Analog Voice ServiceModule for ISR4K
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Name:
SM-X-72FXS
- Description:
- Fixed Port High Density Analog Voice ServiceModule for ISR4K
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 889728056946
- Condition:
- Warranty:
- 3
- List Price:
$17,107.00
- Price:
$9,025.0047.2% off
Quantity:
1
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SM-X-72FXS Overview
SM-X-72FXS is a high-density FXS telephony module engineered to bring legacy analog voice connectivity into modern IP-based communication systems. Built with 72 dedicated FXS ports featuring standard RJ-11 connectors, this module bridges traditional telephone lines with digital networks to ensure high-quality voice transmission alongside modern data services.
SM-X-72FXS is compatible with leading voice gateways and IP-PBX systems, including solutions from Cisco and Avaya, making it ideal for upgrading call centers, enterprise communications, and service provider networks. Its modular design and straightforward installation allow operators to efficiently expand capacity while meeting rigorous industry standards for performance and reliability.
SM-X-72FXS price is $9,025.00, a 47.2% saving from the Cisco list price of $17,107.00. SM-X-72FXS is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for SM-X-72FXS for additional pricing. Browse the full Cisco Catalyst 8000 Series Edge Platforms Modules & Cards series or explore all Cisco products.
SM-X-72FXS Specifications
- Product Type
- Telephony Module
- Module Type
- FXS Module
- Data Rate
- N/A
- Connector Type
- RJ-11
- Supported Protocols
- N/A
- Form Factor
- Modular
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 5V
- Compatibility
- Cisco / Avaya
- Max Speed
- N/A
- Supported Features
- N/A
- Power Consumption
- 15W
- Interface Ports
- N/A
- Expansion Slots
- N/A
- Product Name
- SM-X-72FXS
- Height
- N/A
- Width
- N/A
- Depth
- N/A
- Weight
- N/A
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| SM-X-72FXS |  NIM-LTEA-EA |  C-SM-16P4M2X |  NIM-16A |  UCS-E160S-M3/K9 | |
|---|---|---|---|---|---|
| Compatibility | Cisco / Avaya | Cisco / Juniper / Arista / Dell / HP | Routers, Switches, Servers | Cisco / Juniper / Arista | Cisco UCS |
| Connector Type | RJ-11 | PCIe | RJ-45 | RJ-45 | SFP+ |
| Data Rate | N/A | 150Mbps | 1Gbps | 1G/10G | 10Gbps |
| Depth | N/A | N/A | 2.0 inches | 6.0 inches | N/A |
| Expansion Slots | N/A | NIM | N/A | NIM | N/A |
| Form Factor | Modular | Modular | PCIe | Modular | Modular |
| Height | N/A | N/A | 1.0 inches | 0.5 inches | N/A |
| Input Voltage | 5V | 3.3V | 3.3V | 3.3V | N/A |
| Interface Ports | N/A | N/A | Ethernet | Ethernet | Ethernet |
| Max Speed | N/A | 150Mbps | 1Gbps | 10Gbps | 10Gbps |
| Module Type | FXS Module | 4G LTE | Ethernet | Ethernet | Ethernet |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Power Consumption | 15W | 5W | 8W | 15W | N/A |
| Product Name | SM-X-72FXS | NIM-LTEA-EA | C-SM-16P4M2X 16-Port Ethernet Module | NIM-16A | Cisco UCS-E160S-M3/K9 |
| Product Type | Telephony Module | Network Module | Network Module / Network Card | Network Module Card | Network Module / Network Card |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | N/A |
| Supported Features | N/A | Auto-negotiation / Wake-on-LAN / Jumbo Frames / QoS | Auto-negotiation / Jumbo Frames / QoS | Auto-negotiation / Wake-on-LAN / Jumbo Frames / QoS | Auto-negotiation, Jumbo Frames, QoS |
| Supported Protocols | N/A | TCP/IP | TCP/IP | TCP/IP | TCP/IP |
| Weight | N/A | N/A | 1.2 lbs | 1.2 lbs | N/A |
| Width | N/A | N/A | 3.5 inches | 4.4 inches | N/A |
Reviews & Ratings
C
Christopher Shaw
4
Reliable voice performance with consistent call quality.
D
Daniel Hayes
4
Professional module for ISR4K deployments.
E
Ethan Miles
4
Smooth integration and dependable telephony support.
F
Frederick Cole
5
Strong voice capacity for enterprise environments.
G
George Porter
5
Efficient analog service expansion with predictable uptime.
Questions & Answers
What is the SM-X-72FXS - Fixed Port High Density Analog Voice Service Module for ISR4K?
The SM-X-72FXS is a fixed-port analog voice module for Cisco ISR 4000 Series routers, delivering 72 FXS ports to integrate legacy telephony devices and IP networks.
Which Cisco ISR4K routers support the SM-X-72FXS module?
The SM-X-72FXS is supported on Cisco ISR 4451-X, 4431, 4351, and 4321 platforms with an available SM-X expansion slot and compatible power supply.
How many FXS ports does the SM-X-72FXS provide?
The module provides 72 fixed FXS (Foreign Exchange Subscriber) ports for connecting analog telephones, fax machines, and key systems directly to an ISR4K router.
What analog signaling protocols are supported by SM-X-72FXS?
The SM-X-72FXS supports loop-start, ground-start, open-loop, and E&M signaling to accommodate a wide range of legacy voice network requirements.
Which audio codecs are supported on the SM-X-72FXS?
It supports G.711 μ-law and A-law, G.729A/B, and G.726 codecs for efficient voice compression and excellent call quality over IP.
Is an additional software license required for SM-X-72FXS?
No separate license is required; voice port functionality is enabled by default on Cisco ISR4K platforms equipped with the SM-X-72FXS module.
How do I install the SM-X-72FXS in an ISR4K router?
Power down the router, insert the SM-X-72FXS into the SM-X expansion slot, secure the module with mounting screws, then power on and verify with “show platform” commands.
What is the power consumption of the SM-X-72FXS?
The module consumes up to 120W under full load; ensure your ISR4K power supply meets Cisco’s boost power requirements for voice modules.
Does the SM-X-72FXS support hot-swapping?
No, the SM-X-72FXS is not hot-swappable; always power down the ISR4K router before installing or removing the module to avoid damage.
Can the SM-X-72FXS be upgraded in service?
Software feature upgrades are supported via Cisco IOS XE images; hardware changes require a maintenance window and full power cycle.
What voice quality can I expect from the SM-X-72FXS?
With support for industry-standard codecs and echo cancellation, the module delivers carrier-grade voice quality and low latency for mission-critical voice applications.
How do I configure dial peers for the SM-X-72FXS module?
Use Cisco IOS XE commands under voice-port configuration mode to define dial-peer sessions; for example, “dial-peer voice 1 pots destination-pattern 9T port 0/0/0:1.”
Does SM-X-72FXS support PSTN failover or backup trunks?
Yes, you can configure primary SIP or MGCP trunks with the SM-X-72FXS as a backup PSTN gateway, enabling automatic failover on carrier network outages.
What are common use cases for the SM-X-72FXS module?
Typical use cases include legacy PBX integration, site survivability for cloud telephony, fax over IP, and branch office analog voice consolidation.
Where can I purchase the SM-X-72FXS module?
You can order the SM-X-72FXS through Cisco authorized distributors and resellers or via Cisco’s online ordering portal using SKU SM-X-72FXS.