Cisco Cisco IOS Software Release 12.4(23)

VWIC2-2MFT-T1/E1

2-port T1/E1 Multiflex Trunk Voice/WAN interface card

All Cisco 3700 series platforms

VWIC2-1MFT-G703

1-port G.703 Multiflex Trunk Voice/WAN interface card

All Cisco 3700 series platforms

VWIC2-2MFT-G703

2-port G.703 Multiflex Trunk Voice/WAN interface card

All Cisco 3700 series platforms

Voice/WAN interface cards (VWICs) plug into the voice slots in the High Density Voice Network Module, into the 
WAN slots on the Fast Ethernet mixed-media LAN/WAN network modules, or into the WAN slots on the Cisco 3700 
series motherboard. 

WIC-1B-S/T

1-port ISDN BRI

All Cisco 3700 series platforms

WIC-1B-S/T-V3

1-port ISDN BRI

All Cisco 3700 series platforms

WIC-1B-U

1-port ISDN BRI with NT1

All Cisco 3700 series platforms

WIC-1B-U-V2

1-port ISDN BRI with NT1

All Cisco 3700 series platforms

WAN interface cards plug into the mixed-media LAN/WAN network modules or into the WAN slots of the 
Cisco 3700 series motherboard.

NM-1CT1

1-port channelized T1/ISDN PRI network module

All Cisco 3700 series platforms

NM-1CT1-CSU

1-port channelized T1/ISDN PRI with CSU network module All Cisco 3700 series platforms

NM-2CT1

2-port channelized T1/ISDN PRI network module

All Cisco 3700 series platforms

NM-2CT1-CSU

2-port channelized T1/ISDN PRI with CSU network module All Cisco 3700 series platforms

NM-1CE1B

1-port channelized E1/ISDN PRI balanced network module

All Cisco 3700 series platforms

NM-1CE1T1-PRI

1-port channelized T1/ISDN PRI network module

All Cisco 3700 series platforms

NM-1CE1U

1-port channelized E1/ISDN PRI unbalanced network 
module

All Cisco 3700 series platforms

NM-2CE1B

2-port channelized E1/ISDN PRI balanced network module

All Cisco 3700 series platforms

NM-2CE1T1-PRI

2-port channelized T1/ISDN PRI network module

All Cisco 3700 series platforms

NM-2CE1U

2-port channelized E1/ISDN PRI unbalanced network 
module

All Cisco 3700 series platforms

NM-4B-S/T

4-port ISDN BRI network module

All Cisco 3700 series platforms

NM-4B-U

4-port ISDN BRI with NT1 network module

All Cisco 3700 series platforms

NM-8B-S/T

8-port ISDN BRI network module (S/T interface)

All Cisco 3700 series platforms

NM-8B-U

8-port ISDN BRI with NT1 network module (U interface)

All Cisco 3700 series platforms

WIC-1AM

1-port analog modem WAN interface card (WIC)

All Cisco 3700 series platforms

WIC-2AM

2-port analog modem WAN interface card (WIC)

All Cisco 3700 series platforms

NM-6DM

6-port digital modem network module

All Cisco 3700 series platforms

NM-12DM

12-port digital modem network module

All Cisco 3700 series platforms

NM-18DM

18-port digital modem network module

All Cisco 3700 series platforms

NM-24DM

24-port digital modem network module

All Cisco 3700 series platforms