/etc/asterisk/dsp.conf is in asterisk-config 1:11.13.1~dfsg-2+deb8u5.
This file is owned by root:root, with mode 0o640.
The actual contents of the file can be viewed below.
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;
; Length of sound (in milliseconds) before a period of silence is considered
; to be a change from talking to silence or a period of noise converts silence
; to talking. [default=256]
;
;silencethreshold=256
; DTMF Reverse Twist and Normal Twist is the difference in power between the row and column energies.
;
; Normal Twist is where the Column energy is greater than the Row energy
; Reverse Twist is where the Row energy is greater.
;
; Power level difference between frequencies for different Administrations/RPOAs
; Power Gain equiv
; normal reverse dB's
; AT&T(default) 6.31 2.51 8dB(normal), 4dB(reverse)
; NTT 3.16 3.16 Max. 5dB
; Danish 3.98 3.98 Max. 6dB
; Australian 10.0 10.0 Max. 10dB
; Brazilian 7.94 7.94 Max. 9dB
; ETSI 3.98 3.98 Max. 6dB
;previous version compatible AT&T values
; RADIO_RELAX disabled, and relaxdtmf=no
; 6.30 2.50 7.99dB(normal), 3.98dB(reverse)
; RADIO_RELAX disabled, and relaxdtmf=yes
; 6.30 4.00 7.99dB(normal), 6.02dB(reverse)
; RADIO_RELAX enabled, and relaxdtmf=no
; 6.30 2.50 7.99dB(normal), 3.984dB(reverse)
; RADIO_RELAX enabled, and relaxdtmf=yes
; 6.30 6.50 7.99dB(normal), 8.13dB(reverse)
;If you don't know what these mean, don't change them.
;dtmf_normal_twist=6.31
;dtmf_reverse_twist=2.51
;relax_dtmf_normal_twist=6.31
;relax_dtmf_reverse_twist=3.98
;successive number hits/misses of 12.75ms before a digit/nodigit is considered valid
;dtmf_hits_to_begin=2
;dtmf_misses_to_end=3
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