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I can make CAS calls successfully, but why don't I see any protocol trace when using v6trace?

Check that the -s99,224 configuration switch was used during firmware download.

-s99,n  Enables protocol trace generation by the software on the card. An 8-bit parameter is used to vary what channel (or timeslots) is to be traced. To trace one particular channel the least significant 5 bits are used to give the correct channel reference. To trace all 32 channels -s99,224 (128 + 64 + 32 = 224) is usually used. So the 8-bit word would be as follows:

128 64 32 16 8 4 2 1
1 1 1 0 0 0 0 0

For example -s99,193 is used to trace 1 channel. The 8-bit word would be:

128 64 32 16 8 4 2 1
1 1 0 0 0 0 0 1

More information can be found in the firmware configuration switch guide for your particular protocol in the $ACULAB_ROOT/firmware directory