SKU: 4058946921

Cisco 2-Port FXS/FXS-E/DID and 4-Port FXO Network Interface Module

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Description

Cisco 2-Port FXS/FXS-E/DID and 4-Port FXO Network Interface ModuleUnlock flexible voice connectivity within Ciscos 4000 Series Integrated Services Routers (ISRs) with this high density Network Interface Module (NIM). The module combines 2 ports of FXS FXS E DID and 4 FXO ports into a single, compact card that slots into Cisco 4000 Series ISRs with available NIM bays. Built for modern hybrid voice deployments, it lets you connect analog phones or Direct Inward Dialing (DID) capable devices while preserving your IP

Unlock flexible voice connectivity within Cisco’s 4000 Series Integrated Services Routers (ISRs) with this high-density Network Interface Module (NIM). The module combines 2 ports of FXS/FXS-E/DID and 4 FXO ports into a single, compact card that slots into Cisco 4000 Series ISRs with available NIM bays. Built for modern hybrid voice deployments, it lets you connect analog phones or Direct Inward Dialing (DID) capable devices while preserving your IP telephony architecture for SIP trunks, unified communications, and branch-office resilience. Designed for scalability, reliability, and seamless integration with Cisco’s voice ecosystem, this NIM is a cornerstone for a cost-efficient, future-ready voice gateway.

  • Flexible telephony in one module: 2 ports that can be configured as FXS, FXS-E, or DID alongside 4 FXO ports provide versatile analog and voice gateway capabilities for small offices to distributed sites.
  • High-density, scalable expansion for Cisco 4000 Series: Integrates into the ISR’s NIM slots to maximize port density without expanding the chassis footprint, enabling progressive growth of voice services as your network evolves.
  • DID support and hybrid voice integration: The FXS ports support Direct Inward Dialing configurations, enabling direct dialing into your private networks, while FXO ports connect to PSTN trunks or legacy circuits for reliable mixed-mode operation.
  • Designed for reliability and ease of management: Part of the Cisco 4000 family, this NIM is designed for long-term operation with straightforward IOS XE-based management and consistent configuration across Cisco voice platforms.
  • Seamless interoperability with Cisco voice ecosystems: Optimized to work with Cisco Unified Communications Manager (CUCM), Cisco Unified Border Element (CUBE), and other Cisco voice services, providing a cohesive, end-to-end solution for enterprise voice.

Technical Details of Cisco 2-Port FXS/FXS-E/DID and 4-Port FXO Network Interface Module

  • Product type: Network Interface Module (NIM) for Cisco 4000 Series Integrated Services Routers (ISR).
  • Ports: 2 x FXS/FXS-E/DID ports; 4 x FXO ports; all analog interfaces for POTS and telephony lines.
  • Platform compatibility: Cisco 4000 Series ISR chassis with available NIM slots; supports integration across multiple modules in up to three NIM slots on the chassis.
  • Signaling and features: Provides traditional analog telephony interfaces with support for DID on FXS ports; suitable for hybrid voice deployments combining IP telephony with legacy PSTN access.
  • Management and compatibility: Configured and managed through Cisco IOS XE software, enabling consistent voice service provisioning alongside data routing and security features on Cisco ISRs.

How to install Cisco 2-Port FXS/FXS-E/DID and 4-Port FXO Network Interface Module

  • Power down the Cisco 4000 Series ISR or verify hot-swappable compatibility, then locate an available NIM slot suitable for the module.
  • Align the NIM’s edge connectors with the backplane and gently insert the card into the slot until the latches engage securely.
  • Secure the module, re-enable power if you powered down, and confirm that the IOS XE detects the new NIM in the chassis.
  • Enter the appropriate voice port configurations for FXS/FXS-E/DID and FXO, including dial peers, voice ports, and line groups to route calls as required by your deployment.
  • Test the setup end-to-end by provisioning test extensions, placing inbound and outbound calls, and validating interoperability with SIP trunks and any connected PSTN lines.

Frequently asked questions

Q: What capabilities does the Cisco 2-Port FXS/FXS-E/DID and 4-Port FXO Network Interface Module provide?

A: It adds versatile analog telephony interfaces to Cisco 4000 Series ISRs, delivering 2 FXS/FXS-E/DID ports and 4 FXO ports for a hybrid voice gateway solution that supports both DID-enabled analog phones and legacy PSTN connections.

Q: Which Cisco platforms are compatible with this NIM?

A: This module is designed for Cisco 4000 Series Integrated Services Routers with available NIM slots, enabling flexible expansion and consolidated voice and data services within a single router chassis.

Q: Can the FXS ports handle Direct Inward Dialing (DID)?

A: Yes. The FXS ports on this module can be configured to support DID, providing direct inward dialing paths for convenient call routing into your private network.

Q: How many NIM slots does the Cisco 4000 Series support, and how does this module fit in?

A: The Cisco 4000 Series ISRs support multiple NIM slots (up to three in many configurations); this module is designed to occupy one NIM slot, expanding your analog telephony capacity while preserving space for additional modules as your network grows.

Q: What management interface is used to configure this NIM?

A: Configuration and management are performed through Cisco IOS XE, ensuring consistency with other Cisco voice and data services and allowing centralized administration alongside routing, security, and IP telephony features.

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SKU: 4058946921

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Tracy and Christina
Houston, US
★★★★★ 5
Amazing!
Format: Kindle, Format: Kindle
This book was phenomenal, I devoured it within a few days! For this being a debut novel, it is fantastic and I would’ve thought the author was a seasoned author. I have zero complaints about this book. Let me start by saying that the world building was phenomenal. I could picture everything in my head because of how detailed it was — that’s how good it was written. And I absolutely love the “captive/captor” trope so much, it’s become one of my favorite tropes, so I was pleasantly surprised to see that this book had that. I loved the banter between Rogue and Ara — they’re both snarky and witty, plus with the romantic tension, it made the dialogue that much better. Speaking of romantic tension, yes there is spice but not so much of it that it overrides the plot, which I loved. For me, this would probably be on the 3/5 level of spice. This book had a ton of plot twists and I thoroughly enjoyed it.
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Reviewed in the United States on November 13, 2024
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R Spires
Dallas, US
★★★★★ 4
High on Tropes and Satisfaction
Format: Kindle
This is a great Romantasy book full of action, adventure, and everything you look for in this genre. I won’t lie: it does kinda feel like the author found every common trope from every successful book of this kind and threw them all into this novel. But if it ain’t broke, don’t fix it. Especially in romance, there’s a large audience who has specific expectations, and they want them every time. Nothing wrong with that and many times I’m one of them. I have no idea what defines a spoiler honestly, so spoiler alert!!!!!!! Tropes include: Only one bed at the inn/bar Dissatisfaction with life before hunk appears Lost royalty The chosen one Montage of dress up time followed by shocked hunk Forbidden romance between two from rival peoples Power that cannot be controlled, simply guided/asked Gathering intel at the inn/bar FMC who knows how to fight/use weapons well There’s probably more but no need to list them all. Good story and I would recommend!
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Reviewed in the United States on June 14, 2024
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SJS
Phoenix, US
★★★★★ 5
Just read it. You won’t regret it.
Format: Hardcover
This book completely blew me away. I loved every single character—not just the FMC and MMC, but the side characters too, which is rare. In a first book, side characters can feel flat while the focus is on world-building, but that definitely wasn’t the case here. The romantic tension between the FMC and MMC was so good—seriously addictive. The plot itself felt pretty straightforward at first, and the world-building was easy to follow. It even gave me Heartless Hunter / Wolf King vibes… until the last 20 pages. And wow—those final pages. I usually spot plot twists coming, and I thought this one was going to be predictable, but I was completely wrong. That ending genuinely shocked me—I haven’t had that reaction to a book in a long time. I’m already counting down to book two (and that teaser chapter? Absolutely brutal). Just read it. You won’t regret it.
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Reviewed in the United States on May 4, 2026
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Nicole
Pawtucket, US
★★★★★ 4
4 Stars for Now!
Format: Kindle
I DEVOURED this book. I was in a huge slump after reading a horrible series right before this but after 3 pages of this book, I was hooked. I read the whole book in 2 days. I think the author did an amazing job at writing an engaging story with an amazing twist at the end. I know many readers feel betrayed by the twist and find the narrator to be unreliable but I feel that the twist was done in a great unsuspecting way. Though I do feel betrayed, I think there is so much room for redemption in the second book! The author also did an amazing job at world/character building. She was able to do so without interrupting the story which is one of my huge pet peeves. A lot of authors build by taking breaks in the plot or dialogue which I find choppy and disengaging but this author was able to build in an engaging way. There was some lack of world/character building but I think that was due to keeping reader in the dark. The world, politics, and characters were all very easy to understand. I found the romance a little lackluster and a bit off-kilter. Some of it was really pushy and rushed which left a bad taste in my mouth. I do hope the author delves deeper into the romance in coming books. The FMC was a breath of fresh air. She was not whiny or stuck-up like most books. She was never afraid to accept help from others but she was still able to shine with her intelligence. Not once did I think she made a poor decision just for the sake of a plot point. She was really easy to like. The MMC could use some work but I think that will happen more in coming books. This is a MUST read, my only advice would be to wait until it is a finished series!
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Reviewed in the United States on July 30, 2025
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Reading_with_Magic
Port Orchard, US
★★★★★ 5
Need book 2 please :-)
Format: Kindle
From the very first chapter, Metal Slinger hooked me and refused to let go. Set in a brutal, metal-bound world where power is carved from steel and survival depends on strength, strategy, and sheer will, this story follows a young woman forced into a dangerous system where control over metal isn’t just magic — it’s dominance, protection, and rebellion. When she’s pulled into escalating conflict and shifting alliances, she quickly learns that power always comes with a cost. The magic system is sharp and immersive without being overwhelming. The way metal manipulation is woven into combat and politics makes every confrontation feel cinematic and high-stakes. It’s gritty, tense, and beautifully layered. The Brynn, our FMC absolutely shines. She’s fierce but not untouchable, resilient without feeling unrealistic. Watching her navigate betrayal, survival, and the slow awakening of her own strength felt earned every step of the way. There’s grit in her fight scenes and vulnerability in her quieter moments that make her deeply human. And the tension? Immaculate. The chemistry simmers under the surface before sparking into something electric. Every reluctant alliance, every charged interaction, every moment of “are they about to destroy each other or kiss?” had me flying through pages. The pacing is relentless — no filler, no wasted scenes. Twists land hard. Stakes keep climbing. And that ending? Absolutely feral. The kind that leaves you staring at the wall for a minute before immediately checking when book two releases. ✨ Gritty metal-based magic ⚔️ High-stakes survival 🔥 Slow-burn tension 🖤 Fierce, layered heroine 💥 A finale that HITS (but cliffhanger!) This is one of those fantasies that reminds you why you fell in love with the genre in the first place. If this is just Book One, I am more than ready to be emotionally wrecked again in the sequel.
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Reviewed in the United States on February 14, 2026

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