This object specifies the backward signal requesting information about what type of echo suppressor is in use on the connection so far. Echo suppressor mismatches cause audible echo on long-distance calls, so this signal exists to let the two ends negotiate or confirm suppressor state before the voice path is fully established, directly affecting perceived call quality on the specific trunk where it is exchanged. In response to this request, the far end might reply with ccasFwdRSCCInsertEchoSuppressor to indicate it has inserted an outgoing half echo suppressor for this particular international call leg.