Hi,
Are you using EMS or HMS? Can you make sure you have correct configuration on SIP trunk (CUCM side) and make sure on MP you have configured the correct CUCM configuration under SIP config.
Login to your MP as root and see check below:
1. cd /var/mp
2. ls -l
and see if you see cca directory or not? If not then looks like you configured the MP for HMS but you don't have hardware MCU or possibly MCU is not online or not configure properly.
If you see above directory do below:
cd /var/mp/cca
tail -f tvsip* | grep -e '--'
make a test call and you will see sometihng on your screen, capture the whole stuff and post here will look tell you what's going on but if you don't see any calls coming that means call is not even landing to MP then check your CUCM for possibly PT, CSS, RP, RP, Trunk etc.
Please let me know if you need any more info.
If you need immediate assistance kindly open a TAC case.
HTH
Arun