                                                           audio/telephone-event Parameters

   Last Updated
           2008-06-16

   This registry is also available in XML and plain text formats.

   Registry included below

     * Event Code Registry

Event Code Registry

   Reference
           [RFC4733]

   Registration Procedures
           Specification Required and Expert Review

   Event Code                                                         Event Name                                                          Reference
       0      DTMF digit "0"                                                                                                              [RFC4733]
       1      DTMF digit "1"                                                                                                              [RFC4733]
       2      DTMF digit "2"                                                                                                              [RFC4733]
       3      DTMF digit "3"                                                                                                              [RFC4733]
       4      DTMF digit "4"                                                                                                              [RFC4733]
       5      DTMF digit "5"                                                                                                              [RFC4733]
       6      DTMF digit "6"                                                                                                              [RFC4733]
       7      DTMF digit "7"                                                                                                              [RFC4733]
       8      DTMF digit "8"                                                                                                              [RFC4733]
       9      DTMF digit "9"                                                                                                              [RFC4733]
       10     DTMF digit "*"                                                                                                              [RFC4733]
       11     DTMF digit "#"                                                                                                              [RFC4733]
       12     DTMF digit "A"                                                                                                              [RFC4733]
       13     DTMF digit "B"                                                                                                              [RFC4733]
       14     DTMF digit "C"                                                                                                              [RFC4733]
       15     DTMF digit "D"                                                                                                              [RFC4733]
       16     Reserved
     17-22    Unassigned
       23     CRdSeg: second segment of V.8 bis CRd signal                                                                                [RFC4734]
       24     CReSeg: second segment of V.8 bis CRe signal                                                                                [RFC4734]
       25     MRdSeg: second segment of V.8 bis MRd signal                                                                                [RFC4734]
       26     MReSeg: second segment of V.8 bis MRe signal                                                                                [RFC4734]
       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    [RFC4734]
              pattern.
       28     V8bISeg: first segment of initiating V.8 bis signal                                                                         [RFC4734]
       29     V8bRSeg: first segment of responding V.8 bis signal                                                                         [RFC4734]
       30     V21L300: 300 bits/s low channel V.21 indication                                                                             [RFC4734]
       31     V21H300: 300 bits/s high channel V.21 indication                                                                            [RFC4734]
       32     ANS (V.25 Answer tone). Also known as CED (T.30 Called tone).                                                               [RFC4734]
       33     /ANS (V.25 Answer tone after phase shift). Also known as /CED (T.30 Called tone after phase shift)                          [RFC4734]
       34     ANSam (V.8 amplitude modified Answer tone)                                                                                  [RFC4734]
       35     /ANSam (V.8 amplitude modified Answer tone after phase shift)                                                               [RFC4734]
       36     CNG (T.30 Calling tone)                                                                                                     [RFC4734]
       37     V.21 channel 1 (low channel), '0' bit                                                                                       [RFC4734]
       38     V.21 channel 1, '1' bit. Also used for ESiSeg (second segment of V.8 bis ESi signal).                                       [RFC4734]
       39     V.21 channel 2, '0' bit                                                                                                     [RFC4734]
       40     V.21 channel 2, '1' bit. Also used for ESrSeg (second segment of V.8 bis ESr signal).                                       [RFC4734]
     41-48    Reserved
       49     CT (V.25 Calling Tone)                                                                                                      [RFC4734]
     50-51    Unassigned
       52     ANS2225: 2225 Hz indication for text telephony                                                                              [RFC4734]
       53     CI (V.8 Call Indicator signal preamble)                                                                                     [RFC4734]
       54     V.21 preamble flag (T.30)                                                                                                   [RFC4734]
       55     V21L110: 110 bits/s V.21 indication for text telephony                                                                      [RFC4734]
       56     B103L300: Bell 103 low channel indication for text telephony                                                                [RFC4734]
       57     V23Main: V.23 main channel indication for text telephony                                                                    [RFC4734]
       58     V23Back: V.23 back channel indication for text telephony                                                                    [RFC4734]
       59     Baud4545: 45.45 bits/s Baudot indication for text telephony                                                                 [RFC4734]
       60     Baud50: 50 bits/s Baudot indication for text telephony                                                                      [RFC4734]
       61     VBDGen: Tone patterns indicative of use of an unidentified modem type                                                       [RFC4734]
       62     XCIMark: A pattern of bits modulated in the V.23 main channel, emitted by a V.18 calling terminal.                          [RFC4734]
       63     V32AA: A pattern of bits modulated at 4800 bits/s, emitted by a V.32/V.23bis calling terminal.                              [RFC4734]
     64-88    Reserved
     90-95    Unassigned
     96-112   Reserved
    113-120   Unassigned
      121     Continuity check-tone                                                                                                       [RFC5244]
      122     Continuity verify-tone                                                                                                      [RFC5244]
      123     MF Code 11 (SS No. 5) or KP3P/ST3P (R1)                                                                                     [RFC5244]
      124     MF KP (SS No. 5) or KP1 (R1)                                                                                                [RFC5244]
      125     MF KP2 (SS No. 5) or KP2P/ST2P (R1)                                                                                         [RFC5244]
      126     MF ST (SS No. 5 and R1)                                                                                                     [RFC5244]
      127     MF Code 12 (SS No. 5) or KP'/STP (R1)                                                                                       [RFC5244]
      128     SS No. 5 or R1 digit "0"                                                                                                    [RFC5244]
      129     SS No. 5 or R1 digit "1"                                                                                                    [RFC5244]
      130     SS No. 5 or R1 digit "2"                                                                                                    [RFC5244]
      131     SS No. 5 or R1 digit "3"                                                                                                    [RFC5244]
      132     SS No. 5 or R1 digit "4"                                                                                                    [RFC5244]
      133     SS No. 5 or R1 digit "5"                                                                                                    [RFC5244]
      134     SS No. 5 or R1 digit "6"                                                                                                    [RFC5244]
      135     SS No. 5 or R1 digit "7"                                                                                                    [RFC5244]
      136     SS No. 5 or R1 digit "8"                                                                                                    [RFC5244]
      137     SS No. 5 or R1 digit "9"                                                                                                    [RFC5244]
    138-143   Reserved
      144     ABCD signalling state '0000'                                                                                                [RFC5244]
      145     ABCD signalling state '0001'                                                                                                [RFC5244]
      146     ABCD signalling state '0010'                                                                                                [RFC5244]
      147     ABCD signalling state '0011'                                                                                                [RFC5244]
      148     ABCD signalling state '0100'                                                                                                [RFC5244]
      149     ABCD signalling state '0101'                                                                                                [RFC5244]
      150     ABCD signalling state '0110'                                                                                                [RFC5244]
      151     ABCD signalling state '0111'                                                                                                [RFC5244]
      152     ABCD signalling state '1000'                                                                                                [RFC5244]
      153     ABCD signalling state '1001'                                                                                                [RFC5244]
      154     ABCD signalling state '1010'                                                                                                [RFC5244]
      155     ABCD signalling state '1011'                                                                                                [RFC5244]
      156     ABCD signalling state '1100'                                                                                                [RFC5244]
      157     ABCD signalling state '1101'                                                                                                [RFC5244]
      158     ABCD signalling state '1110'                                                                                                [RFC5244]
      159     ABCD signalling state '1111'                                                                                                [RFC5244]
    160-168   Reserved
      169     Unassigned
    170-173   Reserved
      174     Metering pulse                                                                                                              [RFC5244]
      175     Trunk unavailable                                                                                                           [RFC5244]
      176     MFC forward signal 1                                                                                                        [RFC5244]
      177     MFC forward signal 2                                                                                                        [RFC5244]
      178     MFC forward signal 3                                                                                                        [RFC5244]
      179     MFC forward signal 4                                                                                                        [RFC5244]
      180     MFC forward signal 5                                                                                                        [RFC5244]
      181     MFC forward signal 6                                                                                                        [RFC5244]
      182     MFC forward signal 7                                                                                                        [RFC5244]
      183     MFC forward signal 8                                                                                                        [RFC5244]
      184     MFC forward signal 9                                                                                                        [RFC5244]
      185     MFC forward signal 10                                                                                                       [RFC5244]
      186     MFC forward signal 11                                                                                                       [RFC5244]
      187     MFC forward signal 12                                                                                                       [RFC5244]
      188     MFC forward signal 13                                                                                                       [RFC5244]
      189     MFC forward signal 14                                                                                                       [RFC5244]
      190     MFC forward signal 15                                                                                                       [RFC5244]
      191     MFC backward signal 1                                                                                                       [RFC5244]
      192     MFC backward signal 2                                                                                                       [RFC5244]
      193     MFC backward signal 3                                                                                                       [RFC5244]
      194     MFC backward signal 4                                                                                                       [RFC5244]
      195     MFC backward signal 5                                                                                                       [RFC5244]
      196     MFC backward signal 6                                                                                                       [RFC5244]
      197     MFC backward signal 7                                                                                                       [RFC5244]
      198     MFC backward signal 8                                                                                                       [RFC5244]
      199     MFC backward signal 9                                                                                                       [RFC5244]
      200     MFC backward signal 10                                                                                                      [RFC5244]
      201     MFC backward signal 11                                                                                                      [RFC5244]
      202     MFC backward signal 12                                                                                                      [RFC5244]
      203     MFC backward signal 13                                                                                                      [RFC5244]
      204     MFC backward signal 14                                                                                                      [RFC5244]
      205     MFC backward signal 15                                                                                                      [RFC5244]
      206     A bit signalling state '0'                                                                                                  [RFC5244]
      207     A bit signalling state '1'                                                                                                  [RFC5244]
      208     AB bit signalling state '00'                                                                                                [RFC5244]
      209     AB bit signalling state '01'                                                                                                [RFC5244]
      210     AB bit signalling state '10'                                                                                                [RFC5244]
      211     AB bit signalling state '11'                                                                                                [RFC5244]
    212-255   Unassigned
