--- ISDN D channel --- Device: COM3 [USB Serial Port] Line 1 No. : 13 Date : 21.01.2026 Time: 03:29:01:830 Length: 163 Direction: Net -> User CRC : Ok --- HEX Data --- 02 01 10 14 08 02 00 01 05 A1 04 03 80 90 A3 18 03 A9 83 82 1C 19 9F AA 06 80 01 00 82 01 00 8B 01 00 A1 0B 02 02 01 A8 02 01 29 03 02 01 8E 1C 17 9F AA 06 80 01 00 82 01 00 8B 01 02 A1 09 02 02 01 A9 02 01 22 05 00 1C 22 9F AA 06 80 01 00 82 01 00 8B 01 02 A1 14 02 02 01 AA 02 01 3B 30 0B 30 09 0A 01 05 0A 01 04 0A 01 03 1C 1F 9F AA 06 80 01 00 82 01 00 8B 01 00 A1 11 02 02 01 AB 02 01 00 80 08 4F 70 65 72 61 74 6F 72 6C 05 00 83 31 30 30 70 05 80 35 30 30 35 7D 02 91 81 95 32 01 81 --- Layer 2 Data Link --- 000 02 000000-- SAPI : 0 Call control procedures ------1- C/R : 1 Command (Net -> User) -------0 EA : 0 Octet extended 001 01 0000000- TEI : 0 Non-automatic -------1 EA : 1 Final octet 002 10 0001000- N(S) : 8 -------0 Format : 0 Information Type : I 003 14 0001010- N(R) : 10 -------0 P : 0 not set --- Layer 3 --- 004 08 00001000 PD : 8 Q.931 user-network call control messages 005 02 0000---- Reserved ----0010 CR length: 2 006 00 0------- CR flag : 0 Origination -0000000 007 01 00000001 CR : 1 008 05 0------- Reserved -0000101 Message : 5 SETUP --- Layer 3 information elements --- 009 A1 1------- Type : 1 Single Octet -0100001 IE : 33 Sending complete ------------------------------------ 010 04 0------- Type : 0 Variable Length -0000100 IE : 4 Bearer capability 011 03 00000011 Length : 3 012 80 1------- Extension : 1 Final octet -00----- Coding standard : 0 CCITT standardized coding ---00000 Info transf. capabil.: 0 speech 013 90 1------- Extension : 1 Final octet -00----- Transfer mode : 0 circuit Mode ---10000 Info transf. rate : 16 64 kbit/s 014 A3 1------- Extension : 1 Final octet -01----- Layer identifier : 1 Layer 1 identifier ---00011 User info L1 protocol: 3 Rec. G.711 A-law ------------------------------------ 015 18 0------- Type : 0 Variable Length -0011000 IE : 24 Channel identification 016 03 00000011 Length : 3 017 A9 1------- Extension : 1 Final octet -0------ Interface ident. pre.: 0 interface implicitly identified --1----- Interface type : 1 other interface ---0---- Spare : 0 Constant ----1--- Preferred/exclusive : 1 exclusive: only the indicated channel is acceptable -----0-- D-channel indicator : 0 the channel identified is not the D-channel ------01 Info channel select. : 1 as indicated in following octets 018 83 1------- Extension : 1 Final octet -00----- Coding standard : 0 CCITT standardized coding ---0---- Number / Map : 0 channel is indicated by the number in the following octet ----0011 Channel type : 3 B-channel units 019 82 1------- Extension : 1 Final octet -0000010 Channel number : 2 ------------------------------------ 020 1C 0------- Type : 0 Variable Length -0011100 IE : 28 Facility 021 19 00011001 Length : 25 022 9F 1------- Extension : 1 Final octet -00----- Spare : 0 Constant ---11111 Service discriminator: 31 <- value not allowed! 023 AA Unknown Component 10------ Component class: 2 Context-specific --1----- | form : 1 CONSTRUCTED ---01010 | tag : 10 [10] 024 06 0------- Length form : 0 Definite short -0000110 Length : 6 025 80 10------ Component class: 2 Context-specific --0----- | form : 0 PRIMITIVE ---00000 | tag : 0 [0] 026 01 0------- Length form : 0 Definite short -0000001 Length : 1 027 00 00000000 Value : ? (decoding unknown) 028 82 10------ Component class: 2 Context-specific --0----- | form : 0 PRIMITIVE ---00010 | tag : 2 [2] 029 01 0------- Length form : 0 Definite short -0000001 Length : 1 030 00 00000000 Value : ? (decoding unknown) 031 8B Unknown Component 10------ Component class: 2 Context-specific --0----- | form : 0 PRIMITIVE ---01011 | tag : 11 [11] 032 01 0------- Length form : 0 Definite short -0000001 Length : 1 033 00 00000000 Value : ? (decoding unknown) 034 A1 Unknown Component 10------ Component class: 2 Context-specific --1----- | form : 1 CONSTRUCTED ---00001 | tag : 1 [1] 035 0B 0------- Length form : 0 Definite short -0001011 Length : 11 036 02 00------ Component class: 0 UNIVERSAL --0----- | form : 0 PRIMITIVE ---00010 | tag : 2 INTEGER 037 02 0------- Length form : 0 Definite short -0000010 Length : 2 038 01 00000001 039 A8 10101000 Value : 424 (0x1A8) 040 02 00------ Component class: 0 UNIVERSAL --0----- | form : 0 PRIMITIVE ---00010 | tag : 2 INTEGER 041 01 0------- Length form : 0 Definite short -0000001 Length : 1 042 29 00101001 Value : 41 (0x29) 043 03 00------ Component class: 0 UNIVERSAL --0----- | form : 0 PRIMITIVE ---00011 | tag : 3 BIT STRING 044 02 0------- Length form : 0 Definite short -0000010 Length : 2 045 01 00000001 046 8E 10001110 Value : ? (decoding unknown) ------------------------------------ 047 1C 0------- Type : 0 Variable Length -0011100 IE : 28 Facility 048 17 00010111 Length : 23 049 9F 1------- Extension : 1 Final octet -00----- Spare : 0 Constant ---11111 Service discriminator: 31 <- value not allowed! 050 AA Unknown Component 10------ Component class: 2 Context-specific --1----- | form : 1 CONSTRUCTED ---01010 | tag : 10 [10] 051 06 0------- Length form : 0 Definite short -0000110 Length : 6 052 80 10------ Component class: 2 Context-specific --0----- | form : 0 PRIMITIVE ---00000 | tag : 0 [0] 053 01 0------- Length form : 0 Definite short -0000001 Length : 1 054 00 00000000 Value : ? (decoding unknown) 055 82 10------ Component class: 2 Context-specific --0----- | form : 0 PRIMITIVE ---00010 | tag : 2 [2] 056 01 0------- Length form : 0 Definite short -0000001 Length : 1 057 00 00000000 Value : ? (decoding unknown) 058 8B Unknown Component 10------ Component class: 2 Context-specific --0----- | form : 0 PRIMITIVE ---01011 | tag : 11 [11] 059 01 0------- Length form : 0 Definite short -0000001 Length : 1 060 02 00000010 Value : ? (decoding unknown) 061 A1 Unknown Component 10------ Component class: 2 Context-specific --1----- | form : 1 CONSTRUCTED ---00001 | tag : 1 [1] 062 09 0------- Length form : 0 Definite short -0001001 Length : 9 063 02 00------ Component class: 0 UNIVERSAL --0----- | form : 0 PRIMITIVE ---00010 | tag : 2 INTEGER 064 02 0------- Length form : 0 Definite short -0000010 Length : 2 065 01 00000001 066 A9 10101001 Value : 425 (0x1A9) 067 02 00------ Component class: 0 UNIVERSAL --0----- | form : 0 PRIMITIVE ---00010 | tag : 2 INTEGER 068 01 0------- Length form : 0 Definite short -0000001 Length : 1 069 22 00100010 Value : 34 (0x22) 070 05 00------ Component class: 0 UNIVERSAL --0----- | form : 0 PRIMITIVE ---00101 | tag : 5 NULL 071 00 0------- Length form : 0 Definite short -0000000 Length : 0 ------------------------------------ 072 1C 0------- Type : 0 Variable Length -0011100 IE : 28 Facility 073 22 00100010 Length : 34 074 9F 1------- Extension : 1 Final octet -00----- Spare : 0 Constant ---11111 Service discriminator: 31 <- value not allowed! 075 AA Unknown Component 10------ Component class: 2 Context-specific --1----- | form : 1 CONSTRUCTED ---01010 | tag : 10 [10] 076 06 0------- Length form : 0 Definite short -0000110 Length : 6 077 80 10------ Component class: 2 Context-specific --0----- | form : 0 PRIMITIVE ---00000 | tag : 0 [0] 078 01 0------- Length form : 0 Definite short -0000001 Length : 1 079 00 00000000 Value : ? (decoding unknown) 080 82 10------ Component class: 2 Context-specific --0----- | form : 0 PRIMITIVE ---00010 | tag : 2 [2] 081 01 0------- Length form : 0 Definite short -0000001 Length : 1 082 00 00000000 Value : ? (decoding unknown) 083 8B Unknown Component 10------ Component class: 2 Context-specific --0----- | form : 0 PRIMITIVE ---01011 | tag : 11 [11] 084 01 0------- Length form : 0 Definite short -0000001 Length : 1 085 02 00000010 Value : ? (decoding unknown) 086 A1 Unknown Component 10------ Component class: 2 Context-specific --1----- | form : 1 CONSTRUCTED ---00001 | tag : 1 [1] 087 14 0------- Length form : 0 Definite short -0010100 Length : 20 088 02 00------ Component class: 0 UNIVERSAL --0----- | form : 0 PRIMITIVE ---00010 | tag : 2 INTEGER 089 02 0------- Length form : 0 Definite short -0000010 Length : 2 090 01 00000001 091 AA 10101010 Value : 426 (0x1AA) 092 02 00------ Component class: 0 UNIVERSAL --0----- | form : 0 PRIMITIVE ---00010 | tag : 2 INTEGER 093 01 0------- Length form : 0 Definite short -0000001 Length : 1 094 3B 00111011 Value : 59 (0x3B) 095 30 00------ Component class: 0 UNIVERSAL --1----- | form : 1 CONSTRUCTED ---10000 | tag : 16 SEQUENCE (OF) 096 0B 0------- Length form : 0 Definite short -0001011 Length : 11 097 30 00------ Component class: 0 UNIVERSAL --1----- | form : 1 CONSTRUCTED ---10000 | tag : 16 SEQUENCE (OF) 098 09 0------- Length form : 0 Definite short -0001001 Length : 9 099 0A 00------ Component class: 0 UNIVERSAL --0----- | form : 0 PRIMITIVE ---01010 | tag : 10 ENUMERATED 100 01 0------- Length form : 0 Definite short -0000001 Length : 1 101 05 00000101 Value : 5 102 0A 00------ Component class: 0 UNIVERSAL --0----- | form : 0 PRIMITIVE ---01010 | tag : 10 ENUMERATED 103 01 0------- Length form : 0 Definite short -0000001 Length : 1 104 04 00000100 Value : 4 105 0A 00------ Component class: 0 UNIVERSAL --0----- | form : 0 PRIMITIVE ---01010 | tag : 10 ENUMERATED 106 01 0------- Length form : 0 Definite short -0000001 Length : 1 107 03 00000011 Value : 3 ------------------------------------ 108 1C 0------- Type : 0 Variable Length -0011100 IE : 28 Facility 109 1F 00011111 Length : 31 110 9F 1------- Extension : 1 Final octet -00----- Spare : 0 Constant ---11111 Service discriminator: 31 <- value not allowed! 111 AA Unknown Component 10------ Component class: 2 Context-specific --1----- | form : 1 CONSTRUCTED ---01010 | tag : 10 [10] 112 06 0------- Length form : 0 Definite short -0000110 Length : 6 113 80 10------ Component class: 2 Context-specific --0----- | form : 0 PRIMITIVE ---00000 | tag : 0 [0] 114 01 0------- Length form : 0 Definite short -0000001 Length : 1 115 00 00000000 Value : ? (decoding unknown) 116 82 10------ Component class: 2 Context-specific --0----- | form : 0 PRIMITIVE ---00010 | tag : 2 [2] 117 01 0------- Length form : 0 Definite short -0000001 Length : 1 118 00 00000000 Value : ? (decoding unknown) 119 8B Unknown Component 10------ Component class: 2 Context-specific --0----- | form : 0 PRIMITIVE ---01011 | tag : 11 [11] 120 01 0------- Length form : 0 Definite short -0000001 Length : 1 121 00 00000000 Value : ? (decoding unknown) 122 A1 Unknown Component 10------ Component class: 2 Context-specific --1----- | form : 1 CONSTRUCTED ---00001 | tag : 1 [1] 123 11 0------- Length form : 0 Definite short -0010001 Length : 17 124 02 00------ Component class: 0 UNIVERSAL --0----- | form : 0 PRIMITIVE ---00010 | tag : 2 INTEGER 125 02 0------- Length form : 0 Definite short -0000010 Length : 2 126 01 00000001 127 AB 10101011 Value : 427 (0x1AB) 128 02 00------ Component class: 0 UNIVERSAL --0----- | form : 0 PRIMITIVE ---00010 | tag : 2 INTEGER 129 01 0------- Length form : 0 Definite short -0000001 Length : 1 130 00 00000000 Value : 0 (0x0) 131 80 10------ Component class: 2 Context-specific --0----- | form : 0 PRIMITIVE ---00000 | tag : 0 [0] 132 08 0------- Length form : 0 Definite short -0001000 Length : 8 133 4F 01001111 134 70 01110000 135 65 01100101 136 72 01110010 137 61 01100001 138 74 01110100 139 6F 01101111 140 72 01110010 Value : ? (decoding unknown) ------------------------------------ 141 6C 0------- Type : 0 Variable Length -1101100 IE : 108 Calling party number 142 05 00000101 Length : 5 143 00 0------- Extension : 0 Octet extended -000---- Type of number : 0 unknown ----0000 Numbering plan ident.: 0 unknown 144 83 1------- Extension : 1 Final octet -00----- Presentation ident. : 0 presentation allowed ---000-- Spare : 0 Constant ------11 Screening indicator : 3 network provided 145 31 0------- Spare : 0 Constant -0110001 Number digit : 49 '1' 146 30 0------- Spare : 0 Constant -0110000 Number digit : 48 '0' 147 30 0------- Spare : 0 Constant -0110000 Number digit : 48 '0' "100" ------------------------------------ 148 70 0------- Type : 0 Variable Length -1110000 IE : 112 Called party number 149 05 00000101 Length : 5 150 80 1------- Extension : 1 Final octet -000---- Type of number : 0 unknown ----0000 Numbering plan ident.: 0 unknown 151 35 0------- Spare : 0 Constant -0110101 Number digit : 53 '5' 152 30 0------- Spare : 0 Constant -0110000 Number digit : 48 '0' 153 30 0------- Spare : 0 Constant -0110000 Number digit : 48 '0' 154 35 0------- Spare : 0 Constant -0110101 Number digit : 53 '5' "5005" ------------------------------------ 155 7D 0------- Type : 0 Variable Length -1111101 IE : 125 High layer compatibility 156 02 00000010 Length : 2 157 91 1------- Extension : 1 Final octet -00----- Coding standard : 0 CCITT standardized coding ---100-- Interpretation : 4 First (primary only) high layer characteristics identification (in octet 4) to be used in the call ------01 Present. method : 1 high layer protocol profile (without specification of attributes) 158 81 1------- Extension : 1 Final octet -0000001 High layer char. id. : 1 Telephony ------------------------------------ 159 95 1------- Type : 1 Single Octet -001---- IE : 1 Shift ----0--- Procedure: 0 Locking shift -----101 Codeset : 5 for national use ------------------------------------ 160 32 0------- Type : 0 Variable Length -0110010 IE : 50 Party category 161 01 00000001 Length : 1 162 81 10000001 coding unknown Content of unknown Information element: 81 "" ------------------------------------ --- ISDN D channel --- Device: COM3 [USB Serial Port] Line 1 No. : 14 Date : 21.01.2026 Time: 03:29:01:860 Length: 14 Direction: User -> Net CRC : Ok --- HEX Data --- 00 01 14 12 08 02 80 01 02 18 03 A9 83 82 --- Layer 2 Data Link --- 000 00 000000-- SAPI : 0 Call control procedures ------0- C/R : 0 Command (User -> Net) -------0 EA : 0 Octet extended 001 01 0000000- TEI : 0 Non-automatic -------1 EA : 1 Final octet 002 14 0001010- N(S) : 10 -------0 Format : 0 Information Type : I 003 12 0001001- N(R) : 9 -------0 P : 0 not set --- Layer 3 --- 004 08 00001000 PD : 8 Q.931 user-network call control messages 005 02 0000---- Reserved ----0010 CR length: 2 006 80 1------- CR flag : 1 Destination -0000000 007 01 00000001 CR : 1 008 02 0------- Reserved -0000010 Message : 2 CALL PROCEEDING --- Layer 3 information elements --- 009 18 0------- Type : 0 Variable Length -0011000 IE : 24 Channel identification 010 03 00000011 Length : 3 011 A9 1------- Extension : 1 Final octet -0------ Interface ident. pre.: 0 interface implicitly identified --1----- Interface type : 1 other interface ---0---- Spare : 0 Constant ----1--- Preferred/exclusive : 1 exclusive: only the indicated channel is acceptable -----0-- D-channel indicator : 0 the channel identified is not the D-channel ------01 Info channel select. : 1 as indicated in following octets 012 83 1------- Extension : 1 Final octet -00----- Coding standard : 0 CCITT standardized coding ---0---- Number / Map : 0 channel is indicated by the number in the following octet ----0011 Channel type : 3 B-channel units 013 82 1------- Extension : 1 Final octet -0000010 Channel number : 2 ------------------------------------