ToneScan()

Since 16.23.0, 18.9.0, 19.1.0 Applications Found this useful? Upvote it. ×

Wait for period of time while scanning for call progress tones

Last reviewed 2026-04-14

ToneScan([zone,timeout,threshold,options])
Dialplan Builder -- build your ToneScan() command
Call progress zone. Default is the system default.
Maximum amount of time, in seconds, to wait for call progress or signal tones. Default is forever.
DSP threshold required for a match. A higher number will require a longer match and may reduce false positives, at the expense of false negatives. Default is 1.
Enable fax machine detection. By default, this is disabled.
Enable voice detection. By default, this is disabled.
Full arguments reference
  • zone - Call progress zone. Default is the system default.
  • timeout - Maximum amount of time, in seconds, to wait for call progress or signal tones. Default is forever.
  • threshold - DSP threshold required for a match. A higher number will require a longer match and may reduce false positives, at the expense of false negatives. Default is 1.
  • options
    • f - Enable fax machine detection. By default, this is disabled.
    • v - Enable voice detection. By default, this is disabled.
Description

Waits for a a distinguishable call progress tone and then exits. Unlike a conventional scanner, this is not currently capable of scanning for modem carriers.

  • TONESCANSTATUS
    • RINGING - Audible ringback tone
    • BUSY - Busy tone
    • SIT - Special Information Tones
    • VOICE - Human voice detected
    • DTMF - DTMF digit
    • FAX - Fax (answering)
    • MODEM - Modem (answering)
    • DIALTONE - Dial tone
    • NUT - UK Number Unobtainable tone
    • TIMEOUT - Timeout reached before any positive detection
    • HANGUP - Caller hung up before any positive detection
Arguments
  • zone - Call progress zone. Default is the system default.
  • timeout - Maximum amount of time, in seconds, to wait for call progress or signal tones. Default is forever.
  • threshold - DSP threshold required for a match. A higher number will require a longer match and may reduce false positives, at the expense of false negatives. Default is 1.
  • options
    • f - Enable fax machine detection. By default, this is disabled.
    • v - Enable voice detection. By default, this is disabled.
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