The Cisco IP Communications voice/fax network modules provide enterprises managed service providers and service providers the ability to directly connect the public switched telephone network (PSTN) and traditional telephony equipment (private branch exchange [PBX] key system analog telephones fax machines etc.) to Cisco 2800 2900 3800 and 3900 Series Unified Communications routers.

Four channels of analog/BRI voice using any supported coder-decoder (codec)

Cisco Unified Communications Routers:

• Cisco 2600 Series
• Cisco 3600 Series
• Cisco 3700 Series