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Key facts:
The packet type is determined by the TYPE code in the header:
0000 NULL No payload. Used for acknowledgements or flow control. 0001 POLL No payload. Used by the master to poll slaves. Requires acknowledgement. 0111 EV3 Extended Voice (no error correction), 1 slot: maximum 30 data bytes plus a 16-bit CRC. 1100 EV4 Extended Voice (2/3 rate FEC), 3 slots: maximum 120 data bytes plus a 16-bit CRC. 1101 EV5 Extended Voice (no error correction), 3 slots: maximum 180 data bytes plus a 16-bit CRC.