fmtp Attribute
The fmtp attribute shown in the following tables takes the form:
a=fmtp:<amrParameter> <parameterValues>
amrParameter contains one of the AMR/AMR-WB RTP-specific parameters listed below.
channels
crc
interleaving
max-red
maxtime
mode-change-capability
mode-change-neighbor
mode-change-period
mode-set
octet-align
ptime
robust-sorting
parameterValue: contains the value of the specified parameter.