What port on the 7100 is connected to your 1224ST?
Do a show run interface (then interface and #) and send me the output on the 7100.
Can you show the config of your 1224ST, do a show run and post it, remove any passwords
Also, what port is the 7100 connected to on the 1224ST.
I ended up figuring it out on my own. It was my own fault. I didn't realize my ports came defaulted as VLAN 1 on the 1224ST switch instead of TRUNK like the NetVanta 7100. I updated this and I'm good to go now. System is completely up and running with SIP trunks.
Thanks for your help!