Number of retrains or rate renegotiations requested by this modem. Number of retrains or rate renegotiations requested by remote modem. No answer, busy, etc. For PCM connection only, the downstream digital loss. For K56flex connection only, the V.8bis info sent by the server.
Meaning is defined at the server and by convention.
Example above is from a recent Ascend MAX in m-Law. All rights reserved.