Asterisk Project : Application_WaitForSilence This page last changed on Mar 30, 2011 by wikibot. # WaitForSilence() ### Synopsis Waits for a specified amount of silence. ### Description Waits for up to silencerequired milliseconds of silence, iterations times. An optional timeout specified the number of seconds to return after, even if we do not receive the specified amount of silence. Use timeout with caution, as it may defeat the purpose of this application, which is to wait indefinitely until silence is detected on the line. This is particularly useful for reverse-911-type call broadcast applications where you need to wait for an answering machine to complete its spiel before playing a message. Typically you will want to include two or more calls to WaitForSilence when dealing with an answering machine; first waiting for the spiel to finish, then waiting for the beep, etc. Examples: WaitForSilence(500,2) will wait for 1/2 second of silence, twice WaitForSilence(1000) will wait for 1 second of silence, once WaitForSilence(300,3,10) will wait for 300ms silence, 3 times, and returns after 10 sec, even if silence is not detected Sets the channel variable Sets the channel variable `None` - `WAITSTATUS` to one of these values: `WAITSTATUS` - `SILENCE` - if exited with silence detected. `TIMEOUT` - if exited without silence detected after timeout. ### Syntax
    WaitForSilence(silencerequired[,iterations[,timeout]])
##### Arguments `silencerequired` `iterations` - If not specified, defaults to `1`. `timeout` - Is specified only to avoid an infinite loop in cases where silence is never achieved. ### See Also Application_WaitForNoise ### Import Version This documentation was imported from Asterisk version SVN-branch-1.8-r311874.

Document generated by Confluence on Oct 04, 2011 12:42