Quick tech specs
- Density Analog Voice Service Module SM-X-16-FXS/2FXO
- FXS x 16 + FXO x 2
- Expansion module
- for Cisco 4451-X; Integrated Services Router 4331, 4351
Know your gear
These Cisco modules provide enterprises, managed services providers, and service providers the ability to directly connect public-switched telephone networks and existing telephony equipment to Cisco compatible routers.