This read-create Integer32, in seconds from 0 to 3600, specifies how long the network congestion tone plays, which is triggered when network resources or bandwidth exceed configured thresholds, with 0 meaning indefinite generation until interrupted. Admins care because this tone is the caller-facing signal that the network itself is overloaded rather than the called party being busy. For example, during a period of link saturation, an admin might check that this timeout is long enough for callers to clearly recognize the congestion tone before giving up.