Cisco SM-X-24FXS-4FXO Voice Fax Module
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Cisco SM-X-24FXS/4FXO Fixed Port High Density Analog Voice Refurbished

Availability: In Stock
Part Number#: SM-X-24FXS/4FXO
List Price was: $24996.15
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Short Description:
SM-X-24FXS/4FXO Fixed Port High Density Analog Voice Service Expansion Module for Intrigued Service Router 4000 Series | Made by Cisco | Refurbished
Product Condition:
Warranty provided by ALLHDD.COM:
90 Days

Optimal Performance and Reliability

The Cisco SM-X-24FXS/4FXO is a fixed port high-density analog voice service module that provides voice connectivity for Cisco ISR 4000 series routers. This module is designed to provide reliable and high-quality voice services for enterprise and service provider networks. To ensure optimal performance and reliability of this module, the following factors should be considered:

  • Power and Cooling: The Cisco SM-X-24FXS/4FXO module requires power and cooling to operate. It is important to ensure that the module is receiving the required power and that the router chassis is properly cooled to prevent overheating.
  • Configuration: The module must be properly configured for optimal performance. This includes configuring the voice interfaces, dial peers, and other related settings.
  • Quality of Service (QoS): QoS settings should be properly configured to ensure that voice traffic is prioritized over other types of traffic. This will help prevent latency and other quality issues that can affect voice call quality.
  • Network Connectivity: The module must be properly connected to the network. This includes ensuring that the network interface is configured correctly and that the network infrastructure is designed to handle the traffic load.
  • Monitoring and Maintenance: Regular monitoring and maintenance of the module is important to ensure that it is functioning properly. This includes monitoring call quality, troubleshooting issues, and performing software updates as needed.

Security Features and Management

The Cisco SM-X-24FXS/4FXO is a high-density analog voice service module that provides up to 24 analog FXS (Foreign Exchange Station) and 4 FXO (Foreign Exchange Office) ports for connecting analog phones, fax machines, and other analog devices to a Cisco Integrated Services Router (ISR). To ensure the security and reliability of the module and the voice traffic that it carries, the module features several security and management features:

  • Secure Communications: The SM-X-24FXS/4FXO module supports Secure Real-Time Transport Protocol (SRTP) and Transport Layer Security (TLS) for secure voice communications. SRTP provides encryption and authentication for voice traffic, while TLS secures the signaling between the module and the router.
  • Network Management: The module supports Simple Network Management Protocol (SNMP), which allows network administrators to monitor and manage the module remotely. The module also supports Cisco IOS Embedded Event Manager (EEM), which enables automation of network management tasks.
  • Quality of Service (QoS): The module supports QoS features such as traffic shaping, classification, and marking to ensure that voice traffic is prioritized over other types of traffic on the network.
  • Voice VLAN: The module supports Voice VLAN, which enables voice traffic to be separated from other types of traffic on the network. This improves security and performance by ensuring that voice traffic is not interfered with by other types of traffic.
  • Call Admission Control (CAC): The module supports CAC, which limits the number of simultaneous calls that can be made on the network. This ensures that the network is not overwhelmed by too many calls at once, which can lead to poor call quality and dropped calls.
  • Voice Policies: The module supports voice policies, which allow network administrators to define and enforce rules for voice traffic on the network. This can include rules for call routing, call recording, and call blocking.
  • Redundancy: The module supports redundancy features such as Hot Standby Router Protocol (HSRP) and Gateway Load Balancing Protocol (GLBP), which provide failover and load balancing capabilities to ensure high availability and reliability of voice services.

Installation and Setup Procedures

The Cisco SM-X-24FXS/4FXO is a service module that provides high-density analog voice connectivity for Cisco ISR G2 and ISR 4000 Series routers. To install and set up the module, follow these procedures:

  • Power off the router before installing the module. Insert the module into an available service module slot on the router.
  • Connect the module to the PSTN or PBX using the appropriate cables. For FXS ports, connect the analog phone or fax machine to the RJ-11 port. For FXO ports, connect the analog trunk line to the RJ-11 port.
  • Power on the router and module. The router will detect the module and install the necessary software.
  • Configure the module using the Cisco IOS command-line interface (CLI) or web-based graphical user interface (GUI). You can configure the module for voice features such as call routing, caller ID, call waiting, and call transfer.
  • Verify the module configuration by making test calls. You can use a test phone or fax machine to make calls through the module.

Main Information about this Cisco SM-X-24FXS/4FXO

  • Manufacturer: Cisco
  • Part Number or SKU # SM-X-24FXS/4FXO
  • Product Type: Service Module- Expansion Module

Technical Information of Voice Module

  • Total Number of Ports: 28
  • Media Type Supported: Twisted Pair
  • Application/Usage: Voice Fax
  • TAA Compliant: No
  • Media Type Supported Twisted Pair

Dimensions & Weight

  • Height: 1.6 Inch
  • Width: 7.4 Inch
  • Depth: 7.6 Inch
  • Weight: 2.21 LBS


  • Compatibility: Cisco 4000 Series ISRs
Product Condition:
Warranty provided by ALLHDD.COM:
90 Days

About Refurbished Products

Refurbished products are typically refurbished by an Original Manufacturer or an affiliate of the manufacturer or 3rd party facility. This product may have minor blemishes due to normal product usage and doesn't necessarily come with documentation and software unless indicated, but has been well tested and generally has never had any defects.

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What does ALLHDD.Com warranty cover?

30-days to 3 years warranty:

Replacement or refund. In the case of material defects, we will try to replace the product first. The product will be replaced before the expiration of the original warranty. For any failure of hardware, if we cannot process the replacement of the product(s)/model(s), we will refund the original selling/invoiced price. The shipping costs and sales tax, if any, are non-refundable. ALLHDD retains the right to decide whether the item(s) will process for replacement or refund.

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