This read-only value reports the ifIndex value of the corresponding ifEntry for this SVC signaling-configuration entry, tying general SVC-related configuration parameters (calling-party insertion, screening mode, address translation mode, etc.) to a specific port. This is the anchor identification field for the whole svcConfig table's per-port signaling policy settings. An engineer auditing SVC signaling policy across many ports would use svcConfigIfIndex to know which port each row of policy configuration belongs to.