Parameter: Fax Modem Pass-Through Parameters: Support V.152 VBD

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Support V.152 auto-switch to Passthrough relay mode.
This forces the SDP attribute gpmd to be negociated.
This list of tones will be detected and switch to passthrough will be done when this parameter is enabled:

  • Bell 103 Tone
  • V.22 USB1 or Bell_ANS
  • Fax calling tone
  • V.21 flags
  • V.8bis CRe tone
  • ANSam/
  • ANS/
  • ANSam
  • ANS
  • V.23 tones (1300, 390)
  • V.21 tones (1650,980)
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