I have this module:NM-4B-S/T
I tried to configure it like this but I am not able to get voice port so I can make dial-peer.
I added the following configuration but no result:
no ip address
isdn switch-type basic-net3
isdn incoming-voice modem
Sadly the NM-4B-S/T does "not" support voice.
Voice Hardware Compatibility Matrix (Cisco 17/26/28/36/37/38xx, VG200, Catalyst 4500/4000, Catalyst 6xxx)
Hope this helps!
Sorry to be the bearer of bad news but the NM-4B-S/T is a data only module and does not support voice termination.