
audio/telephone-event Parameters

(last updated 05 October 2006)

Event Code Registry - per [RFC-ietf-avt-rfc2833bis-15.txt]
Registration Procedures: Specification Required and Expert Review
Event Code  Event Name                                   Reference
----------  -------------------------------------------  ---------
    0       DTMF digit "0"                               [RFC-ietf-avt-rfc2833bis-15.txt]
    1       DTMF digit "1"                               [RFC-ietf-avt-rfc2833bis-15.txt]
    2       DTMF digit "2"                               [RFC-ietf-avt-rfc2833bis-15.txt]
    3       DTMF digit "3"                               [RFC-ietf-avt-rfc2833bis-15.txt]
    4       DTMF digit "4"                               [RFC-ietf-avt-rfc2833bis-15.txt]
    5       DTMF digit "5"                               [RFC-ietf-avt-rfc2833bis-15.txt]
    6       DTMF digit "6"                               [RFC-ietf-avt-rfc2833bis-15.txt]
    7       DTMF digit "7"                               [RFC-ietf-avt-rfc2833bis-15.txt]
    8       DTMF digit "8"                               [RFC-ietf-avt-rfc2833bis-15.txt]
    9       DTMF digit "9"                               [RFC-ietf-avt-rfc2833bis-15.txt]
   10       DTMF digit "*"                               [RFC-ietf-avt-rfc2833bis-15.txt]
   11       DTMF digit "#"                               [RFC-ietf-avt-rfc2833bis-15.txt]
   12       DTMF digit "A"                               [RFC-ietf-avt-rfc2833bis-15.txt]
   13       DTMF digit "B"                               [RFC-ietf-avt-rfc2833bis-15.txt]
   14       DTMF digit "C"                               [RFC-ietf-avt-rfc2833bis-15.txt]
   15       DTMF digit "D"                               [RFC-ietf-avt-rfc2833bis-15.txt]
   16       Reserved
17-22       Unassigned
   23       CRdSeg: second segment of V.8 bis CRd signal [RFC-ietf-avt-rfc2833bisdata-08.txt]                                   |              |
   24       CReSeg: second segment of V.8 bis CRe signal [RFC-ietf-avt-rfc2833bisdata-08.txt]  
   25       MRdSeg: second segment of V.8 bis MRd signal [RFC-ietf-avt-rfc2833bisdata-08.txt]    
   26       MReSeg: second segment of V.8 bis MRe signal [RFC-ietf-avt-rfc2833bisdata-08.txt]  
   27       V32AC: A pattern of bits modulated at 4800   [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            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     [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            bis signal  
   29       V8bRSeg: first segment of responding V.8     [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            bis signal
   30       V21L300: 300 bits/s low channel V.21         [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            indication
   31       V21H300: 300 bits/s high channel V.21        [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            indication 
   32       ANS (V.25 Answer tone).  Also known as CED   [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            (T.30 Called tone).
   33       /ANS (V.25 Answer tone after phase shift).   [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            Also known as /CED (T.30 Called tone after
            phase shift)
   34       ANSam (V.8 amplitude modified Answer tone)   [RFC-ietf-avt-rfc2833bisdata-08.txt]  
   35       /ANSam (V.8 amplitude modified Answer tone   [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            after phase shift)
   36       CNG (T.30 Calling tone)                      [RFC-ietf-avt-rfc2833bisdata-08.txt]  
   37       V.21 channel 1 (low channel), '0' bit        [RFC-ietf-avt-rfc2833bisdata-08.txt]  
   38       V.21 channel 1, '1' bit.  Also used for      [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            ESiSeg (second segment of V.8 bis ESi signal).
   39       V.21 channel 2, '0' bit                      [RFC-ietf-avt-rfc2833bisdata-08.txt]  
   40       V.21 channel 2, '1' bit.  Also used for      [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            ESrSeg (second segment of V.8 bis ESr signal).
41-48       Reserved    
   49       CT (V.25 Calling Tone)                       [RFC-ietf-avt-rfc2833bisdata-08.txt]  
50-51       Unassigned
   52       ANS2225: 2225 Hz indication for text         [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            telephony
   53       CI (V.8 Call Indicator signal preamble)      [RFC-ietf-avt-rfc2833bisdata-08.txt]  
   54       V.21 preamble flag (T.30)                    [RFC-ietf-avt-rfc2833bisdata-08.txt]  
   55       V21L110: 110 bits/s V.21 indication for      [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            text telephony
   56       B103L300: Bell 103 low channel indication    [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            for text telephony 
   57       V23Main: V.23 main channel indication for    [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            text telephony 
   58       V23Back: V.23 back channel indication for    [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            text telephony
   59       Baud4545: 45.45 bits/s Baudot indication     [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            for text telephony
   60       Baud50: 50 bits/s Baudot indication for      [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            text telephony
   61       VBDGen: Tone patterns indicative of use of   [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            an unidentified modem type   
   62       XCIMark: A pattern of bits modulated in      [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            the V.23 main channel, emitted by a V.18 
            calling terminal. 
   63       V32AA: A pattern of bits modulated at 4800   [RFC-ietf-avt-rfc2833bisdata-08.txt]  
            bits/s, emitted by a V.32/V.23bis calling 
            terminal.            
64-88       Reserved
90-95       Unassigned
96-112      Reserved
113-120     Unassigned
121-137     Reserved for [draft-ietf-avt-rfc2833biscas]
138-168     Reserved
  169       Unassigned
170-173     Reserved
174-205     Reserved for [draft-ietf-avt-rfc2833biscas]
206-255     Unassigned

References
----------
[RFC-ietf-avt-rfc2833bis-15.txt]
             H. Schulzrinne and T. Taylor, "RTP Payload for DTMF Digits, 
             Telephony Tones and Telephony Signals", RFC XXXX, Month Year.

[RFC-ietf-avt-rfc2833bisdata-08.txt]  
             H. Schulzrinne and T. Taylor, "Definition of Events For Modem, 
             FAX, and Text Telephony Signals", RFC XXXX, Month Year.

[draft-ietf-avt-rfc2833biscas]
            H. Schulzrinne and T. Taylor, "Definition of Events For 
            Channel-Oriented Telephony Signalling", Work-in-Progress.

(last updated 05 October 2006)

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