This read-create Integer32, in seconds from 0 to 3600, specifies how long the remote ring back tone (played toward the packet network side) is generated unless interrupted by an answer or a delete-connection command, with 0 meaning indefinite generation. It is the packet-network counterpart to the local ring back timeout, and admins tune it separately since the two tones serve different legs of the call. For example, an admin whose remote callers hear ring back cut off too early might increase this value while leaving the local ring back timeout unchanged.