What kind of calls are you trying to receive?
Voice, data, analog, digital, .....
is this over a T1, or a PRI ....
is it supposed to forward to a PBX, internal modems, .....
CCNP, CCDA, CNE
You can receive the incoming voice calls over that VWIC-1MFT-G703, which is 1-Port RJ-48 Multiflex Trunk - E1 for unstructured G.703, from PSTN.
Here is the link which talks about the features supported on that card
Here is the link which explains how to configure that
After that depending on the network setup, you need to configure dial-peers etc For that here is the link which will help you for that