Cannot Load Zaptel module because crc_ccitt table not found

This is because you are missing the crc_ccitt library routine.
Go to /lib/modules/$(uname -r)/build
type:

#>make menuconfig

In the ncurses utility,
Go to Library routines
Include:
CRC-CCITT functions
(save) and (exit)

to build modules, type:
make modules

This will rebuild all your modules, including crc-ccitt. After you are done, the crc-ccitt module will be located in ./lib

copy the crc-ccitt.ko (for 2.6 kernels) or crc-ccitt.o (for 2.4 kernels)to /lib/modules/$(uname -r)/kernel/lib/