This attribute specifies the minimum and maximum modemFax and
fax rate parameters used during negotiation with the remote end
across the subnet.
For g711Only encoding, all modem/fax traffic is carried
uncompressed at 64 kbit/s, so this row of modemFaxRates cannot
be changed.
For g711G726 encoding, rates can change during modemFax and
fax traffic due to congestion in the network. The minimum and
maximum rates that can occur during the modemFax traffic are
specified by the g711G726 row of modemFaxRates.
The relay row of modemFaxRates specifies the minimum and
maximum rates of sending fax machines that are allowed for fax
relay. relay does not apply to modem calls.
The negotiated minimum and maximum modemFax and fax rates
are available in Vsr Svs Framer negotiatedRates.