Which of the following ISDN PRI interfaces are capable for both voice and data:
It would be installed on an 2801 router.
The VWIC supports ISDN for voice.
Remember you will also need PVDM2-xx.
No voice configuration can be done without it.
If I am not mistaken, of the three options only the VWIC is supported on the 2801. It is voice and data capable.