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DMRlink/documents/voice_burst_decoding.txt

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PARTS OF THE PACKET THAT ARE NOT KNOWN ARE WRAPPED WITH STARS -- LIKE THIS **00.00.AC**, MEANS WE DONT KNOW WHAT THAT IS
VOICE HEADER 1: 80 00.04.bf.fd 08 2f.7c.ca 00.00.02 02 **00.00.30.ac** 20 | 80.dd 3b.01 3b.eb.3c.e0 00.00.00.00 | 01 80 00.0a 80 0a 00.60 00 00 00 00.00.02 2f.7c.ca 92.af.70 **00113532**
VOICE HEADER 2: 80 00.04.bf.fd 08 2f.7c.ca 00.00.02 02 **00.00.30.ac** 20 | 80.5d 3b.02 3b.eb.3e.c0 00.00.00.00 | 01 80 00.0a 80 0a 00.60 00 00 00 00.00.02 2f.7c.ca 92.af.70 **00113530**
VOICE HEADER 3: 80 00.04.bf.fd 08 2f.7c.ca 00.00.02 02 **00.00.30.ac** 20 | 80.5d 3b.03 3b.eb.40.a0 00.00.00.00 | 01 80 00.0a 80 0a 00.60 00 00 00 00.00.02 2f.7c.ca 92.af.70 **00113531**
VOICE BURST A: 80 00.04.bf.fd 08 2f.7c.ca 00.00.02 02 **00.00.30.ac** 20 | 80.5d 3b.04 3b.eb.42.80 00.00.00.00 | 8a 14 **40** f8.01.a9.9f.8c.e0.be.00.6a.67.e3.38.2f.80.1a.99.f8.ce.08
VOICE BURST B: 80 00.04.bf.fd 08 2f.7c.ca 00.00.02 02 **00.00.30.ac** 20 | 80.5d 3b.05 3b.eb.44.60 00.00.00.00 | 8a 19 **06** f8.01.a9.9f.8c.e0.be.00.6a.67.e3.38.2f.80.1a.99.f8.ce.08 **0505060612**
VOICE BURST C: 80 00.04.bf.fd 08 2f.7c.ca 00.00.02 02 **00.00.30.ac** 20 | 80.5d 3b.06 3b.eb.46.40 00.00.00.00 | 8a 19 **06** f8.01.a9.9f.8c.e0.be.00.6a.67.e3.38.2f.80.1a.99.f8.ce.08 **0905060516**
VOICE BURST D: 80 00.04.bf.fd 08 2f.7c.ca 00.00.02 02 **00.00.30.ac** 20 | 80.5d 3b.07 3b.eb.48.20 00.00.00.00 | 8a 19 **06** 98.02.b9.4f.a4.d3.bb.b7.96.c7.83.d8.ee.81.19.41.e4.4a.68 **0f05060f16**
VOICE BURST E: 80 00.04.bf.fd 08 2f.7c.ca 00.00.02 02 **00.00.30.ac** 20 | 80.5d 3b.08 3b.eb.4a.00 00.00.00.00 | 8a 22 **16** e8.1a.62.d6.8c.6b.ba.06.3d.0d.eb.04.e9.81.dd.f1.04.86.c8 **000a0a0c000000** 00.00.02 2f.7c.ca **14**
VOICE BURST F: 80 00.04.bf.fd 08 2f.7c.ca 00.00.02 02 **00.00.30.ac** 20 | 80.5d 3b.09 3b.eb.4b.e0 00.00.00.00 | 8a 19 **06** 98.22.d3.d9.00.b4.a6.05.6d.29.a2.17.a8.82.75.14.f8.10.08 **0000000010**
VOICE TERMINATOR: 80 00.04.bf.fd 08 2f.7c.ca 00.00.02 02 **00.00.30.ac** 60 | 80.5e 3e.76 3b.f1.b8.40 00.00.00.00 | 02 80 00.0a 80 0a 00.60 00 00 00 00.00.02 2f.7c.ca 9d.a0.7f **00123535**
VOICE HEADER: 54 Bytes (0-53) (sent 3 times, see notes):
IPSC:
PACKET_TYPE[0]
PEER_ID[1-4]
IPSC_SEQ[5]
SRC_SUB[6-9]
DST_SUB[9-11]
CALL_TYPE[12]
CALL_CONTROL[13-16] (use a random number)
CALL_INFO[17]
RTP:
RTP_HEAD[18-19]
RTP_SEQ[20-21]
RTP_TIMESTMP[22-25]
RTP_SSID[26-29]
RTP PAYLOAD:
BURST_TYPE[30]
RSSI_THRESH_PARITY[31]
LENGTH_TO_FOLLOW[32-33] (in words)
RSSI_STATUS[34]
SLOT_TYPE_SYNC[35]
DATA_SIZE[36-37] Burst data length in bits; 96/8 = 12.. last 4 bytes ont part of Burst??
FULL_LC_BYTE1[38] (PF, R, FLCO)
FULL_LC_FID[39]
VOICE_PDU_SVC_OPT[40]
VOICE_PDU_DST[41-43]
VOICE_PDU_SRC[44-46]
BURST_CRC[47-49]
VOICE_PDU_DST[41-43]
VOICE_PDU_SRC[44-46]
BURST_CRC[47-49] (Reed-Solomon(12,9) if the same as DMR burst, though sample data doesn't come out right)
???[50-53]
VOICE BURST A: 52 Bytes (0-51):
IPSC:
PACKET_TYPE[0]
PEER_ID[1-4]
IPSC_SEQ[5]
SRC_SUB[6-9]
DST_SUB[9-11]
CALL_TYPE[12]
CALL_CONTROL[13-16] (use a random number)
CALL_INFO[17]
RTP:
RTP_HEAD[18-19]
RTP_SEQ[20-21]
RTP_TIMESTMP[22-25]
RTP_SSID[26-29]
RTP PAYLOAD:
BURST_TYPE[30]
LENGTH[31] (bytes left after this one)
???[32]
AMBE_DATA[33-51]
VOICE BURST B-D and maybe F: 57 Bytes (0-56):
IPSC:
PACKET_TYPE[0]
PEER_ID[1-4]
IPSC_SEQ[5]
SRC_SUB[6-9]
DST_SUB[9-11]
CALL_TYPE[12]
CALL_CONTROL[13-16] (use a random number)
CALL_INFO[17]
RTP:
RTP_HEAD[18-19]
RTP_SEQ[20-21]
RTP_TIMESTMP[22-25]
RTP_SSID[26-29]
RTP PAYLOAD:
BURST_TYPE[30]
LENGTH[31] (bytes left after this one)
???[32]
AMBE_DATA[33-51]
???[52-56]
VOICE BURST E: 66 Bytes (0-65):
IPSC:
PACKET_TYPE[0]
PEER_ID[1-4]
IPSC_SEQ[5]
SRC_SUB[6-9]
DST_SUB[9-11]
CALL_TYPE[12]
CALL_CONTROL[13-16] (use a random number)
CALL_INFO[17]
RTP:
RTP_HEAD[18-19]
RTP_SEQ[20-21]
RTP_TIMESTMP[22-25]
RTP_SSID[26-29]
RTP PAYLOAD:
BURST_TYPE[30]
LENGTH[31] (bytes left after this one)
???[32]
AMBE_DATA[33-51]
???[52-64]
VOICE_PDU_DST[59-61]
VOICE_PDU_SRC[62-64]
???[65]
VOICE BURST F, Same as B-D???: 57 Bytes (0-56):
VOICE TERMINATOR: 54 Bytes (0-53)
IPSC:
PACKET_TYPE[0]
PEER_ID[1-4]
IPSC_SEQ[5]
SRC_SUB[6-9]
DST_SUB[9-11]
CALL_TYPE[12]
CALL_CONTROL[13-16] (use a random number)
CALL_INFO[17]
RTP:
RTP_HEAD[18-19]
RTP_SEQ[20-21]
RTP_TIMESTMP[22-25]
RTP_SSID[26-29]
RTP PAYLOAD:
BURST_TYPE[30]
RSSI_THRESH_PARITY[31]
LENGTH_TO_FOLLOW[32-33] (in words)
RSSI_STATUS[34]
SLOT_TYPE_SYNC[35]
DATA_SIZE[36-37] Burst data length in bits; 96/8 = 12.. last 4 bytes ont part of Burst??
IPSC_DATA { [38] to (LENGTH_TO_FOLLOW *2)-4 }
FULL_LC_BYTE1[38] (PF, R, FLCO)
FULL_LC_FID[39]
VOICE_PDU_SVC_OPT[40]
VOICE_PDU_DST[41-43]
VOICE_PDU_SRC[44-46]
BURST_CRC[47-49] (Reed-Solomon(12,9) if the same as DMR burst, though sample data doesn't come out right)
???[50-53]
A is a sync burst
B,C,D are the ame
E has extra data -- EMB?
F is the same length as B,C,D, but has a lot of zeros near the end.
Send a wakeup before starting a call (type 0x85
IPSC Sequence Number - incremented with each call made
RTP Header - Marker set for 1st voide header - 0x80DD, not for anything else 0x805D except terminator 0x80DE, which is the payload type and use is proprietary.
I've decoded the bits in the RTP header, it's going to be ok to use this recipe. Nothing else is going on.
RTP Sequence number -- increment with each packet
RTP timestamp - assumed currently to be 32 bit fixed point number 16bit.16bit seconds. Which would place these packets at 4.8ms apart... seems wrong.
LENGTH_TO_FOLLOW is in 16bit words
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