This read-only INTEGER determines in which direction the idle code (from vismEcanCnfIdlePattern) must be present: both, either, send, or receive. This governs how strictly the echo canceler's idle detection logic requires the idle pattern to be seen relative to signal direction, which affects how reliably it distinguishes truly idle channels. For example, if idle detection is unreliable on a channel where only one direction reliably shows the idle pattern, understanding vismEcanCnfIdleDirection would explain whether either or a stricter both setting is in effect.