TONE_DETECT()

Synopsis

Asynchronously detects a tone

Description

The TONE_DETECT function detects a single-frequency tone and keeps track of how many times the tone has been detected.

When reading this function (instead of writing), supply tx to get the number of times a tone has been detected in the TX direction and rx to get the number of times a tone has been detected in the RX direction.

Syntax

TONE_DETECT(freq[,duration_ms,options])

Arguments

• freq - Frequency of the tone to detect. To disable frequency detection completely (e.g. for signal detection only), specify 0 for the frequency.
• duration_ms - Minimum duration of tone, in ms. Default is 500ms. Using a minimum duration under 50ms is unlikely to produce accurate results.
• options
  • a - Match immediately on Special Information Tones, instead of or in addition to a particular frequency.
  • b - Match immediately on a busy signal, instead of or in addition to a particular frequency.
  • c - Match immediately on a dial tone, instead of or in addition to a particular frequency.
  • d - Custom decibel threshold to use. Default is 16.
  • g - Go to the specified context,exten,priority if tone is received on this channel. Detection will not end automatically.
  • h - Go to the specified context,exten,priority if tone is transmitted on this channel. Detection will not end automatically.
  • n - Number of times the tone should be detected (subject to the provided timeout) before going to the destination provided in the g or h option. Default is 1.
  • r - Apply to received frames only. Default is both directions.
  • s - Squelch tone.
  • t - Apply to transmitted frames only. Default is both directions.
  • x - Destroy the detector (stop detection).

See Also

Import Version

This documentation was imported from Asterisk Version GIT-19-e8c18ee