This read-only INTEGER determines when the echo canceler re-enables and resumes cancellation after being disabled: when modem data energy drops (reenableOnModemData) or at the end of the call (reenableOnCallEnd, not applicable when vismEcanToneDisable is ignore). This setting affects how quickly echo cancellation resumes protecting voice quality after a modem tone triggers a temporary disable, which an admin balances against the risk of re-enabling too early and corrupting ongoing modem data. For instance, a line mostly used for fax rather than mixed voice/data might use reenableOnCallEnd to avoid any risk of cancellation kicking back in mid-transmission.