Have an account?

  •   Personalized content
  •   Your products and support

Need an account?

Create an account

NOTE: This product is no longer being sold.

View the End-of-Life Notice to learn: 

  • End-of-sale and end-of-life dates
  • What replacement products are available
  • Information about product support

Secure routing for medium to large branches

Cisco 3900 Series Integrated Services Routers (ISR) are designed to meet the application demands of today's medium-to-large branches and to evolve to cloud-based services. They deliver virtualized applications and highly secure collaboration through the widest array of WAN connectivity at high performance that offers concurrent services at up to 375 Mbps.


Choose the best 3900 Series ISR for you, all in a modular design.

Before you buy, compare this series with our newer 4000 Series ISRs. The 4000 Series ISRs provide network, compute, and built-in WAN services at up to 10 times the performance of previous-generation ISRs.

Features and benefits

Agile application services

Host Cisco or third-party applications on Cisco UCS-E Server modules that can also run VMware ESXi for mission-critical applications at the branch office. Application delivery assurance services support application visibility and control.

WAN connectivity

We offer the industry's widest choices, including WLAN with 802.11a/g/n, T1/E1, T3/E3, 4G/LTE, xDSL, copper, and fiber Gigabit Ethernet.

WAN optimization

Get support for router-integrated, on-demand WAN optimization and application acceleration through service modules.

Highly integrated security

We offer a comprehensive suite of VPN technology with IPSec and SSL VPNs and WLAN security support for 802.11i. Get threat defense support through firewall and IPS options, and support for encryption and cloud-based security.

Unified communications

Support call processing and voicemail services. Offer a high-quality analog and digital voice and video experience through on-board integrated digital signal processors and analog voice cards.

Medianet services

Gain a more visual, social, and personal experience through video networking solutions for branch users and allow for control of media services through AVC.


Solve problems faster, improve operational efficiency, and reduce your risk of downtime.

Free network inventory service

See if you have obsolete or end-of-support equipment you may want to replace.

Now is the time to evolve your WAN

Read why in the ZK Research white paper. Then speed deployment with our design guide.


For partners

Are you a Cisco partner? Log in to see additional resources.

Looking for a solution from a Cisco partner? Connect with our partner ecosystem.