This MIB is used to set the maximum high-speed redundancy level that will be used for T.38 fax-relay in both the send and receive direction. High speed redundancy refers to the number of additional older data packets included in each T.38 datagram when transferring fax data between endpoints. For example, if an endpoint is transmitting T.38 with a high-speed redundancy level of two and the current sequence number of the data packet is 15, two older (i.e. previously transmitted) data packets with sequence numbers 13 and 14 are included in the T.38 datagram. In general, this makes T.38 data transmission much less susceptible to packet loss in the network. This parameter is configuration to restrict the amount of bandwidth used for T.38 transmission. Setting the maximum high-speed redundancy level does not necessarily mean that the endpoint will always transmit and receive at that level. The endpoint will attempt to transmit at that level only if allowed by the remote endpoint. During call setup the remote endpoint may provide the T38FaxMaxDatagram attribute within its SDP indicating the maximum datagram size that it is able to receive. If this number is smaller than is needed to transmit at the maximum level, the redundancy will be reduced accordingly. Likewise, the local endpoint will construct its T38FaxMaxDatagram attribute according to the maximum high-speed redundancy level configured to restrict the far end from sending T.38 datagram packets with a higher level of high-speed redundancy. This does not necessarily mean that the remote endpoint will transmit at the maximum high-speed redundancy configured, but does guarantee that it will not transmit at a higher level. The remote endpoint may be configured to transmit at a lower high-speed redundancy level, or may choose to reduce the transmission speed to reduce the bandwidth consumption.