Also for those who are interested, I was finally successful with displaying the voice frames in OP25. Made the appropriate code changes and now VC1 through VC9 displays after each LDU1 or LDU2 frame. 

11 bytes of VC info are displayed. For example an unencrypted silence frame from a subscriber unit for VC1 and VC2 appear like

VC1 is  04 0C FD 7B FB 7D F2 7B 3D 9E 44 

VC2 is  04 0C FD 7B FB 7D F2 7B 3D 9E 45   

Also found an issue with the MI that’s displayed in the LDU2. It’s displayed by OP25 as 12 hex bytes. I re-formatted it to display as 9 regular bytes, with the first 8 having relevant information.  

I also added a display of the MI that’s in the HDR. 

I’m starting on coding to display the TGID and RID (Destination and Source) that’s located in the LDU1 and TDU, but the error coding appears not to have been done here. That is way over my head so can anyone be kind enough to help with this?

Once I test my code changes I’ll submit them to Max or anyone else who can incorporate them into the OP25 release. Testing this code is the reason I inquired on how to record a P25 voice channel so a friend can record and send me  test files that I can play it back in OP25.

Here is the sample output from the console:

process_data_unit timeout
NAC 0x461 DUID 0x3 len 72 errs 0
NAC 0x461 DUID 0xF len 216 errs 4    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0x0 len 396 errs 1    HDU: rc 0 MFID 0 ALG 80 KID 0 TGID 20351 MI 00 00 00 00 00 00 00 00 00
NAC 0x461 DUID 0x5 len 864 errs 0    LDU1:
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 44
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 45
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 44
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 45
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 44
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 45
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 44
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 45
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 44
NAC 0x461 DUID 0xA len 864 errs 0    LDU2: rc 0 ALGID 80 KID 0 MI 00 00 00 00 00 00 00 00 00
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 45
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 44
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 45
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 44
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 45
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 44
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 45
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 44
VC: 05 0C 7F 7F 7F BF F3 FF FF FF FD
NAC 0x461 DUID 0x5 len 864 errs 0    LDU1:
VC: 05 73 80 80 80 40 F0 00 00 00 0C
VC: 09 25 F3 27 3C 6D 01 80 4E 7B BF
VC: 95 5E 24 69 E5 44 EC 06 9A 6B E2
VC: 91 25 F7 A3 F9 2E B5 24 C9 D1 73
VC: 99 5E 12 D0 BA 42 FD 37 A7 D6 F8
VC: 99 42 EA 27 6A 1E F7 27 70 5D 13
VC: 95 52 6C 49 96 C6 ED 36 B3 63 F8
VC: 95 5C B7 E3 1A 68 E5 B5 98 AD EB
VC: 95 44 D4 92 AC F0 F4 56 90 B0 3E
NAC 0x461 DUID 0xA len 864 errs 0    LDU2: rc 0 ALGID 80 KID 0 MI 00 00 00 00 00 00 00 00 00
VC: 91 4A B8 53 44 C7 E4 64 48 CE 7D
VC: 85 5B 0D 98 3D E2 ED 05 77 C0 E4
VC: 95 2D A3 CA 65 F1 DD 97 58 DB FB
VC: 91 42 F8 10 78 A3 00 04 6C DC 62
VC: AD 59 4F 5E B6 35 FF F9 60 65 07
VC: 95 37 D7 38 D4 A8 F4 17 93 9A F0
VC: 91 4E B0 02 85 8B 80 06 CC 00 ED
VC: 8D 52 1F 5B C8 E4 80 04 67 94 46
VC: 7D 52 1B 6C 17 1B B5 24 58 D7 01
NAC 0x461 DUID 0x5 len 864 errs 0    LDU1:
VC: 91 48 FA BB 63 F2 D9 A8 EC 9F 70
VC: 8D 46 78 55 D0 89 80 05 A6 95 47
VC: 8D 36 FB 2A 68 87 F4 4B B7 39 06
VC: 4A C9 20 68 AE 6E 00 13 BC AD AB
VC: 5F 54 A8 60 9B EF FF D8 A4 1A B8
VC: 5F 54 B0 A8 6F C5 FF 63 50 A4 95
VC: 5F 1C 99 AC 2B FF FF EF 1D 94 0C
VC: 5F 54 98 EE 1B 63 FF E5 2A F4 9B
VC: 5E B8 D9 F0 3B A2 80 3F 08 89 FE
NAC 0x461 DUID 0xA len 864 errs 0    LDU2: rc 1 ALGID 80 KID 0 MI 00 00 00 00 00 00 00 00 00
VC: 65 B5 A4 E1 6F 93 80 14 24 C6 65
VC: 65 63 C9 4F 0C B9 81 18 CC 12 0C
VC: 71 2A B4 CD 8F 78 48 8C 0C D1 D3
VC: 69 B1 07 BF F8 72 00 1C 90 97 50
VC: 62 B7 94 C3 FD D0 DF E9 80 E1 4B
VC: 62 E1 09 B3 0E 94 FD 5F 64 17 14
VC: 6A BF 48 B2 CF 29 FF 02 55 82 23
VC: 71 45 9A C4 B2 98 00 0B C5 4D FC
VC: 69 4F 74 A8 02 A7 00 0A B2 83 59
NAC 0x461 DUID 0x5 len 864 errs 0    LDU1:
VC: 71 5E 81 E5 9F 44 00 04 BC 6F F0
VC: 65 48 F3 C4 2C 2E 00 08 7C 13 0F
VC: 4A 70 B6 9C B3 ED 80 7F DE A1 5E
VC: 4A B9 9D 00 EF BA 00 10 35 1B 2F
VC: 57 17 2A 5E 42 F9 FF B0 3D 00 BC
VC: 5B 1E 44 D6 BA F8 FF FA 4A B4 B3
VC: 5B 2D 45 B6 2A 78 FF E7 9D 00 6E
VC: 5F 46 98 EC 39 2E FF EF 8F CD B3
VC: 5F 62 8E 6C 90 CF FF CF AB 30 C6
NAC 0x461 DUID 0xA len 864 errs 0    LDU2: rc 0 ALGID 80 KID 0 MI 00 00 00 00 00 00 00 00 00
VC: 65 E7 8D 7B 8B A0 80 13 C9 79 4B
VC: 65 E5 90 96 19 D9 E8 45 44 85 8A
VC: 71 37 EC 8C 2E 07 00 08 0C F5 7B
VC: 71 44 5B 73 15 FA 00 08 A5 15 74
VC: 65 E7 3A 6C 8C 67 80 10 E8 F0 85
VC: 6A AA B9 36 0E 80 7F E5 9D B9 52
VC: 6E CD 98 04 85 E7 F7 EA B3 BB BF
VC: 7D A7 7C C2 CF 05 00 02 1A E1 0C
VC: 79 52 5B 2D 75 9B D0 09 50 56 0F
NAC 0x461 DUID 0x5 len 864 errs 0    LDU1:
VC: 79 5C 45 E9 30 CD D4 0A 58 0D CE
VC: 91 27 DD 6B FC 83 00 03 ED 72 59
VC: 79 E0 E0 85 D5 BF 00 02 F0 9E EC
VC: 51 C3 FD B2 18 E4 00 4A C7 7F 4F
VC: 4A 59 35 0B D5 DF 80 74 20 34 AA
VC: 5A F0 08 2A AB 50 FF FA 84 D2 99
VC: 5A F8 52 84 66 F7 FF F0 31 B7 AA
VC: 5E D4 05 F4 F3 28 FF BF CD 6C 89
VC: 67 4E 58 01 18 E6 FF E7 61 CD 32
NAC 0x461 DUID 0xA len 864 errs 0    LDU2: rc 0 ALGID 80 KID 0 MI 00 00 00 00 00 00 00 00 00
VC: 67 4B 79 A0 5C FE FF E6 53 72 77
VC: 6A E3 47 93 5B 72 FF 82 AE C2 98
VC: 6A 56 73 70 1B 5B FF F9 8D 1F 29
VC: 6A 4E 64 71 D7 A9 FF F8 14 99 52
VC: 69 DF 4D 7A 4C 5D 80 0B B3 E5 E1
VC: 85 B8 07 65 45 47 80 02 54 07 4E
VC: 89 26 75 7D A1 35 00 0C F7 F6 B9
VC: 71 35 AA CE A0 FB 00 0D 5C 48 24
VC: 5D 62 82 2E E8 AD 00 3F 9D 5F 75
NAC 0x461 DUID 0x5 len 864 errs 0    LDU1:
VC: 61 67 28 B5 83 02 00 11 B6 53 CA
VC: 81 4E A7 A4 39 E3 84 06 B4 3D F9
VC: 8D 5A 1D 5A 3C 5A C5 15 9D 48 88
VC: 8D 4F 4A 71 55 A0 00 07 73 FF 95
VC: 95 50 7B 82 93 37 00 00 91 07 E8
VC: 8D 4E 4A 28 D4 67 92 05 9F EB 01
VC: 6D 5F C1 3A 52 4C 88 54 18 08 FE
VC: 8D 35 BB 93 2A 4F 80 15 31 3B 91
VC: 99 5C 33 45 61 59 C4 14 61 F4 10
NAC 0x461 DUID 0xA len 864 errs 0    LDU2: rc 0 ALGID 80 KID 0 MI 00 00 00 00 00 00 00 00 00
VC: 91 48 8E A8 57 87 54 16 27 D2 25
VC: 79 46 BE 67 4E 27 88 06 0C 0B B2
VC: 6D 52 8D 21 65 AC 08 4A DB BA 05
VC: 7D 4F A5 94 CA D9 88 44 C4 E3 52
VC: A5 17 14 0D 1E 1A 02 17 30 0C EB
VC: 79 56 97 2C 1E D8 88 44 8D EA 22
VC: 91 3B 32 7A 25 22 44 17 4C A7 CF
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 44
VC: 04 0C FD 7B FB 7D F2 7B 3D 9E 45
NAC 0x461 DUID 0x3 len 72 errs 0
NAC 0x461 DUID 0xF len 216 errs 2    TDU:
NAC 0x461 DUID 0xF len 216 errs 2    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0xF len 216 errs 0    TDU:
NAC 0x461 DUID 0x3 len 72 errs 0
NAC 0x461 DUID 0x3 len 72 errs 0

thanks,

Joe