phones, and fax machines), and WAN to Cisco® 2600XM, Cisco 2691, 2811, 2821, 2851, Cisco 3700 Series and Cisco 3800 Series Access Routers for either IP Communications capabilities or pure toll bypass. The IP Communications High-Density Digital Voice/Fax Network Modules flexibly operates within two different Cisco AVVID (Architecture for Voice, Video and Integrated Data) IP Telephony environments-the Cisco CallManager system with Survivable Remote Site Telephony (SRST) or Cisco CallManager Express. The network modules can be integrated with these IP Telephony solutions in a Multiservice Access Router, to provide a complete IP Communications solution for full service branch customers.