Multipurpose Internet Mail Extensions (MIME) and Media Types 2011-12-07 Specification Required Unassigned 0 DTMF digit "0" 1 DTMF digit "1" 2 DTMF digit "2" 3 DTMF digit "3" 4 DTMF digit "4" 5 DTMF digit "5" 6 DTMF digit "6" 7 DTMF digit "7" 8 DTMF digit "8" 9 DTMF digit "9" 10 DTMF digit "*" 11 DTMF digit "#" 12 DTMF digit "A" 13 DTMF digit "B" 14 DTMF digit "C" 15 DTMF digit "D" 16 Reserved 17-22 Unassigned 23 CRdSeg: second segment of V.8 bis CRd signal 24 CReSeg: second segment of V.8 bis CRe signal 25 MRdSeg: second segment of V.8 bis MRd signal 26 MReSeg: second segment of V.8 bis MRe signal 27 V32AC: A pattern of bits modulated at 4800 bits/s, emitted by a V.32/V.32bis answering terminal upon detection of the AA pattern. 28 V8bISeg: first segment of initiating V.8 bis signal 29 V8bRSeg: first segment of responding V.8 bis signal 30 V21L300: 300 bits/s low channel V.21 indication 31 V21H300: 300 bits/s high channel V.21 indication 32 ANS (V.25 Answer tone). Also known as CED (T.30 Called tone). 33 /ANS (V.25 Answer tone after phase shift). Also known as /CED (T.30 Called tone after phase shift) 34 ANSam (V.8 amplitude modified Answer tone) 35 /ANSam (V.8 amplitude modified Answer tone after phase shift) 36 CNG (T.30 Calling tone) 37 V.21 channel 1 (low channel), '0' bit 38 V.21 channel 1, '1' bit. Also used for ESiSeg (second segment of V.8 bis ESi signal). 39 V.21 channel 2, '0' bit 40 V.21 channel 2, '1' bit. Also used for ESrSeg (second segment of V.8 bis ESr signal). 41-48 Reserved 49 CT (V.25 Calling Tone) 50-51 Unassigned 52 ANS2225: 2225 Hz indication for text telephony 53 CI (V.8 Call Indicator signal preamble) 54 V.21 preamble flag (T.30) 55 V21L110: 110 bits/s V.21 indication for text telephony 56 B103L300: Bell 103 low channel indication for text telephony 57 V23Main: V.23 main channel indication for text telephony 58 V23Back: V.23 back channel indication for text telephony 59 Baud4545: 45.45 bits/s Baudot indication for text telephony 60 Baud50: 50 bits/s Baudot indication for text telephony 61 VBDGen: Tone patterns indicative of use of an unidentified modem type 62 XCIMark: A pattern of bits modulated in the V.23 main channel, emitted by a V.18 calling terminal. 63 V32AA: A pattern of bits modulated at 4800 bits/s, emitted by a V.32/V.23bis calling terminal. 64-88 Reserved 90-95 Unassigned 96-112 Reserved 113-114 Unassigned 115 North American SIT Segment 1 Low GR-674 116 North American SIT Segment 1 High GR-674 117 North American SIT Segment 2 Low GR-674 118 North American SIT Segment 2 High GR-674 119 North American SIT Segment 3 GR-674 120 North American Coin Deposit GR-506 121 Continuity check-tone 122 Continuity verify-tone 123 MF Code 11 (SS No. 5) or KP3P/ST3P (R1) " North American Ringback GR-506 124 MF KP (SS No. 5) or KP1 (R1) " North American Coin Return GR-506 125 MF KP2 (SS No. 5) or KP2P/ST2P (R1) 126 MF ST (SS No. 5 and R1) " North American Coin Collect / Operator Released GR-506 127 MF Code 12 (SS No. 5) or KP'/STP (R1) 128 SS No. 5 or R1 digit "0" " North American Operator Attached GR-506 129 SS No. 5 or R1 digit "1" 130 SS No. 5 or R1 digit "2" " North American Coin Collect GR-506 131 SS No. 5 or R1 digit "3" 132 SS No. 5 or R1 digit "4" 133 SS No. 5 or R1 digit "5" 134 SS No. 5 or R1 digit "6" 135 SS No. 5 or R1 digit "7" 136 SS No. 5 or R1 digit "8" " North American Operator Released GR-506 137 SS No. 5 or R1 digit "9" 138-143 Reserved 144 ABCD signalling state '0000' 145 ABCD signalling state '0001' 146 ABCD signalling state '0010' 147 ABCD signalling state '0011' 148 ABCD signalling state '0100' 149 ABCD signalling state '0101' 150 ABCD signalling state '0110' 151 ABCD signalling state '0111' 152 ABCD signalling state '1000' 153 ABCD signalling state '1001' 154 ABCD signalling state '1010' 155 ABCD signalling state '1011' 156 ABCD signalling state '1100' 157 ABCD signalling state '1101' 158 ABCD signalling state '1110' 159 ABCD signalling state '1111' 160-168 Reserved 169 Unassigned 170-173 Reserved 174 Metering pulse 175 Trunk unavailable 176 MFC forward signal 1 177 MFC forward signal 2 178 MFC forward signal 3 179 MFC forward signal 4 180 MFC forward signal 5 181 MFC forward signal 6 182 MFC forward signal 7 183 MFC forward signal 8 184 MFC forward signal 9 185 MFC forward signal 10 186 MFC forward signal 11 187 MFC forward signal 12 188 MFC forward signal 13 189 MFC forward signal 14 190 MFC forward signal 15 191 MFC backward signal 1 192 MFC backward signal 2 193 MFC backward signal 3 194 MFC backward signal 4 195 MFC backward signal 5 196 MFC backward signal 6 197 MFC backward signal 7 198 MFC backward signal 8 199 MFC backward signal 9 200 MFC backward signal 10 201 MFC backward signal 11 202 MFC backward signal 12 203 MFC backward signal 13 204 MFC backward signal 14 205 MFC backward signal 15 206 A bit signalling state '0' 207 A bit signalling state '1' 208 AB bit signalling state '00' 209 AB bit signalling state '01' 210 AB bit signalling state '10' 211 AB bit signalling state '11' 212-255 Unassigned