From the config it appears you are using ISDN to make modem calls.
Assuming that you are using correct cards for this setup.
for ISDN PRI: T1/E1-PRI
for MODEM ----PVDM2-XXDM
for ref:
http://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/htpvdm2.html#wp1051926
MULTIPLE_FRAME_ESTABLISHED>>>>>>>>means your isdn layer2/3 ok
line 0/451 0/486
modem Dialin>>>>>>>try modem inout, as dialin is just for incoming calls
transport input all
You need to have modem inout for making out calls assuming you are making out calls.
if still doesnt work please collect the following debugs while making a call
debug isdn q931
debug isdn err
debug isdn eve
also try to make call to any of your phones with just the ISDN config(remove modem config) this will help isolate if isue specific to ISDN connection.
Reply if it helps