
audio/telephone-event Parameters

(last updated 2008-05-29)

Registries included below:
- Event Code Registry 


Registry Name: Event Code Registry 
Reference: [RFC4733]
Registration Procedures: Specification Required and Expert Review

Registry:
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      [RFC4734]  
            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        [RFC4734]  
            bis signal  
29          V8bRSeg: first segment of responding V.8        [RFC4734]  
            bis signal
30          V21L300: 300 bits/s low channel V.21            [RFC4734]  
            indication  
31          V21H300: 300 bits/s high channel V.21           [RFC4734]  
            indication 
32          ANS (V.25 Answer tone).  Also known as CED      [RFC4734]  
            (T.30 Called tone).
33          /ANS (V.25 Answer tone after phase shift).      [RFC4734]  
            Also known as /CED (T.30 Called tone after
            phase shift)
34          ANSam (V.8 amplitude modified Answer tone)      [RFC4734]  
35          /ANSam (V.8 amplitude modified Answer tone      [RFC4734]  
            after phase shift)
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         [RFC4734]  
            ESiSeg (second segment of V.8 bis ESi signal).
39          V.21 channel 2, '0' bit                         [RFC4734]  
40          V.21 channel 2, '1' bit.  Also used for         [RFC4734]  
            ESrSeg (second segment of V.8 bis ESr signal).
41-48       Reserved    
49          CT (V.25 Calling Tone)                          [RFC4734]  
50-51       Unassigned
52          ANS2225: 2225 Hz indication for text            [RFC4734]  
            telephony
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         [RFC4734]  
            text telephony
56          B103L300: Bell 103 low channel indication       [RFC4734]  
            for text telephony 
57          V23Main: V.23 main channel indication for       [RFC4734]  
            text telephony 
58          V23Back: V.23 back channel indication for       [RFC4734]  
            text telephony
59          Baud4545: 45.45 bits/s Baudot indication        [RFC4734]  
            for text telephony
60          Baud50: 50 bits/s Baudot indication for         [RFC4734]  
            text telephony
61          VBDGen: Tone patterns indicative of use of      [RFC4734]  
            an unidentified modem type   
62          XCIMark: A pattern of bits modulated in         [RFC4734]  
            the V.23 main channel, emitted by a V.18 
            calling terminal. 
63          V32AA: A pattern of bits modulated at 4800      [RFC4734]  
            bits/s, emitted by a V.32/V.23bis calling 
            terminal.            
64-88       Reserved                                        
90-95       Unassigned
96-112      Reserved
113-120     Unassigned
121         Continuity check-tone                           [RFC-ietf-avt-rfc2833biscas-05.txt]
122         Continuity verify-tone                          [RFC-ietf-avt-rfc2833biscas-05.txt]
123         MF Code 11 (SS No. 5) or KP3P/ST3P (R1)         [RFC-ietf-avt-rfc2833biscas-05.txt]
124         MF KP (SS No. 5) or KP1 (R1)                    [RFC-ietf-avt-rfc2833biscas-05.txt]
125         MF KP2 (SS No. 5) or KP2P/ST2P (R1)             [RFC-ietf-avt-rfc2833biscas-05.txt]  
126         MF ST (SS No. 5 and R1)                         [RFC-ietf-avt-rfc2833biscas-05.txt]
127         MF Code 12 (SS No. 5) or KP'/STP (R1)           [RFC-ietf-avt-rfc2833biscas-05.txt]
128         SS No. 5 or R1 digit "0"                        [RFC-ietf-avt-rfc2833biscas-05.txt]
129         SS No. 5 or R1 digit "1"                        [RFC-ietf-avt-rfc2833biscas-05.txt]
130         SS No. 5 or R1 digit "2"                        [RFC-ietf-avt-rfc2833biscas-05.txt]
131         SS No. 5 or R1 digit "3"                        [RFC-ietf-avt-rfc2833biscas-05.txt]
132         SS No. 5 or R1 digit "4"                        [RFC-ietf-avt-rfc2833biscas-05.txt]
133         SS No. 5 or R1 digit "5"                        [RFC-ietf-avt-rfc2833biscas-05.txt]
134         SS No. 5 or R1 digit "6"                        [RFC-ietf-avt-rfc2833biscas-05.txt]
135         SS No. 5 or R1 digit "7"                        [RFC-ietf-avt-rfc2833biscas-05.txt]
136         SS No. 5 or R1 digit "8"                        [RFC-ietf-avt-rfc2833biscas-05.txt]
137         SS No. 5 or R1 digit "9"                        [RFC-ietf-avt-rfc2833biscas-05.txt]
138-143     Reserved
144         ABCD signalling state '0000'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
145         ABCD signalling state '0001'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
146         ABCD signalling state '0010'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
147         ABCD signalling state '0011'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
148         ABCD signalling state '0100'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
149         ABCD signalling state '0101'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
150         ABCD signalling state '0110'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
151         ABCD signalling state '0111'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
152         ABCD signalling state '1000'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
153         ABCD signalling state '1001'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
154         ABCD signalling state '1010'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
155         ABCD signalling state '1011'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
156         ABCD signalling state '1100'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
157         ABCD signalling state '1101'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
158         ABCD signalling state '1110'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
159         ABCD signalling state '1111'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
160-168     Reserved     
169         Unassigned
170-173     Reserved
174         Metering pulse                                  [RFC-ietf-avt-rfc2833biscas-05.txt]
175         Trunk unavailable                               [RFC-ietf-avt-rfc2833biscas-05.txt]
176         MFC forward signal 1                            [RFC-ietf-avt-rfc2833biscas-05.txt]                     
177         MFC forward signal 2                            [RFC-ietf-avt-rfc2833biscas-05.txt]
178         MFC forward signal 3                            [RFC-ietf-avt-rfc2833biscas-05.txt]
179         MFC forward signal 4                            [RFC-ietf-avt-rfc2833biscas-05.txt]
180         MFC forward signal 5                            [RFC-ietf-avt-rfc2833biscas-05.txt]
181         MFC forward signal 6                            [RFC-ietf-avt-rfc2833biscas-05.txt]
182         MFC forward signal 7                            [RFC-ietf-avt-rfc2833biscas-05.txt]
183         MFC forward signal 8                            [RFC-ietf-avt-rfc2833biscas-05.txt]
184         MFC forward signal 9                            [RFC-ietf-avt-rfc2833biscas-05.txt]
185         MFC forward signal 10                           [RFC-ietf-avt-rfc2833biscas-05.txt]
186         MFC forward signal 11                           [RFC-ietf-avt-rfc2833biscas-05.txt]
187         MFC forward signal 12                           [RFC-ietf-avt-rfc2833biscas-05.txt]
188         MFC forward signal 13                           [RFC-ietf-avt-rfc2833biscas-05.txt]
189         MFC forward signal 14                           [RFC-ietf-avt-rfc2833biscas-05.txt]
190         MFC forward signal 15                           [RFC-ietf-avt-rfc2833biscas-05.txt]
191         MFC backward signal 1                           [RFC-ietf-avt-rfc2833biscas-05.txt]
192         MFC backward signal 2                           [RFC-ietf-avt-rfc2833biscas-05.txt]
193         MFC backward signal 3                           [RFC-ietf-avt-rfc2833biscas-05.txt]
194         MFC backward signal 4                           [RFC-ietf-avt-rfc2833biscas-05.txt]
195         MFC backward signal 5                           [RFC-ietf-avt-rfc2833biscas-05.txt]
196         MFC backward signal 6                           [RFC-ietf-avt-rfc2833biscas-05.txt]
197         MFC backward signal 7                           [RFC-ietf-avt-rfc2833biscas-05.txt]
198         MFC backward signal 8                           [RFC-ietf-avt-rfc2833biscas-05.txt]
199         MFC backward signal 9                           [RFC-ietf-avt-rfc2833biscas-05.txt]
200         MFC backward signal 10                          [RFC-ietf-avt-rfc2833biscas-05.txt]
201         MFC backward signal 11                          [RFC-ietf-avt-rfc2833biscas-05.txt]
202         MFC backward signal 12                          [RFC-ietf-avt-rfc2833biscas-05.txt]
203         MFC backward signal 13                          [RFC-ietf-avt-rfc2833biscas-05.txt]
204         MFC backward signal 14                          [RFC-ietf-avt-rfc2833biscas-05.txt]
205         MFC backward signal 15                          [RFC-ietf-avt-rfc2833biscas-05.txt]
206         A bit signalling state '0'                      [RFC-ietf-avt-rfc2833biscas-05.txt]
207         A bit signalling state '1'                      [RFC-ietf-avt-rfc2833biscas-05.txt]
208         AB bit signalling state '00'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
209         AB bit signalling state '01'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
210         AB bit signalling state '10'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
211         AB bit signalling state '11'                    [RFC-ietf-avt-rfc2833biscas-05.txt]
212-255     Unassigned


References
----------
[RFC4733]    H. Schulzrinne and T. Taylor, "RTP Payload for DTMF Digits, 
             Telephony Tones and Telephony Signals", RFC 4733, December 2006.

[RFC4734]    H. Schulzrinne and T. Taylor, "Definition of Events For Modem, 
             FAX, and Text Telephony Signals", RFC 4734, December 2006.

[RFC-ietf-avt-rfc2833biscas-05.txt]
             H. Schulzrinne, T. Taylor, "Definition of Events For Channel-Oriented 
             Telephony Signalling", RFC XXXX, Month Year.


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