where the tcpEchohooks.h was include in TCP-ECHO project

I am using TM4C129EXL board, I looked into the TCP-ECHO example which include a c file named tcpEchoHook.c, I found that the TCP ISR (tcpHandler)  was defined here, so this header file should be include when the RTOS was inited. Can I know where is the tcpEchoHook.h was included?

When there is no system, the project has a startupccs.c in the project which contain the interrupt table. For TI RTOS, where is the interrupt table is ? 

Thanks

Shan