The contents of the SDP "a=" field which contains a key/value pair.
The contents of the SDP "b=" field which specifies the proposed bandwidth to
be used by the session or media.
The contents of the SDP "c=" field which contains connection data.
The contents of the SDP "k=" field which is used to convey encryption
keys.
The contents of the SDP "m=" field with all related fields.
The contents of the SDP message.
The contents of the SDP "o=" field which gives the originator of the session
(their username and the address of the user's host) plus a session id and
session version number.
Return values for the SDP functions.
The contents of the SDP "t=" field which specify the start and stop times for
a conference session.
The contents of the SDP "z=" field which allows the sender to
specify a list of time zone adjustments and offsets from the base
time.