We prefer not to do business over SMS, nor do we have the SMS service activated on our account with RingCentral. Clients are always texting our RC phone lines but never receive a failure message and think we are ignoring them. Rather frustrating for both parties. A failure message that bounces back to the sender stating that their text was not received is feature we have been waiting many years for RC to implement. Tech support can't help and I hope this is the correct avenue to air this concern.