The "vocoder extension" by SV9OAN, for using the open source Codec 2 with D-STAR has been extended to include a mode for FEC (https://github.com/chazapis/pydv). With Codec 2 mode 2400, each encoded voice fragment fits into just 6 bytes. The 3 remaining bytes are used to protect the first 24 bits of the voice data with two applications of the (23, 12) Golay code.
Code changes include defining a new codec in both xlxd and ambed. In ambed, every Codec 2 interface has now one channel for each Codec 2 mode. Also, channel groups have an additional channel, as Codec 2 mode 2400 is used only as input.