CISCO VWIC2-1MFT-T1/E1 Cisco 2nd Generation One and T1/E1 Multiflex Trunk VoiceWAN Interface Card.
Before attempting this configuration, please ensure that you meet the following prerequisites:
Cisco IOS Image -- To run these features on T1/E1 interfaces, you must install an IP Plus or IP Voice image (minimum) of Cisco IOS Release 12.3(14)T or a later release. VWIC Support -- The multiflex VWIC cards are supported on Cisco 2600XM series, Cisco 2691, Cisco 2800 series, Cisco 3700 series, and Cisco 3800 series routers when installed on the network modules listed in Components Used. The multiflex VWIC cards can also be installed in any VIC slot on the router