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Published Option
Default Value: octet-align=0 |
Valid Values: <parameter=value>[|<parameter=value>]*
Changes Take Effect: At start/restart
Specifies the AMR-WB SDP RTP payload configurations offered and accepted by the MCP.
Set to one or more fmtp text values separated by the '|' character.
The fmtp text is the same as would appear in the SDP negotiation (see RFC 4867).
Each "|" separated value configures an AMR-WB payload type. There are two fmtp parameters
that can be set for each payload type, octet-align and mode-set.
Setting octet-align=0 or octet-align=1 disables or enables octet align
mode for the payload.
Setting mode-set restricts the AMR-WB modes for the payload. For example,
setting "mode-set=0,1" only allows modes 0 and 1. If mode-set is not set, all modes are
allowed unless the mode-set is restricted by the remote end. Valid modes are inclusively 0 to 8.
For example, setting this parameter to "octet-align=1" enables one payload type
with octet aligned mode enabled and any mode allowed, and setting it to
"octet-align=0 | octet-align=1" enables two payload types,
one with bandwidth efficient mode enabled and any mode allowed, and one with octet aligned enabled
and any mode allowed.
Note, the mode-set parameter can cause transcoding to be required. For example,
if a prompt to be played is in AMR-WB format mode 5, but only mode 0 is allowed in the
payload, a transcoder will be invoked to transcode from AMR-WB mode 5 to AMR-WB mode 0.
Some AMR-WB implementations may specify a fmtp options that are not actually activated for
the payload. To work around this, the mpc.amrwb.fmtp can be set to "*". For this setting,
all fmtp content in an SDP offer will be ignored and "octet-align=0" will be returned in the SDP
answer. Similarly, an offer for this configuration will be set to "octet-align=0", and all fmtp
content in the answer will be ignored.
Draft Option
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