SDP grouping in a new offer
2012-07-05 11:47:07 GMT
RFC3264 states that:
If an SDP is offered, which is different from the previous SDP, the
new SDP MUST have a matching media stream for each media stream in
the previous SDP. In other words, if the previous SDP had N "m="
lines, the new SDP MUST have at least N "m=" lines. The i-th media
stream in the previous SDP, counting from the top, matches the i-th
media stream in the new SDP, counting from the top. This matching is
necessary in order for the answerer to determine which stream in the
new SDP corresponds to a stream in the previous SDP. Because of
these requirements, the number of "m=" lines in a stream never
decreases, but either stays the same or increases. Deleted media
streams from a previous SDP MUST NOT be removed in a new SDP;
however, attributes for these streams need not be present.
From section 9.1 of RFC5888, it seems the same is applicable with SDP grouping, but is not explicit. Should there be matching m-lines in the new offer even with SDP grouping? Does SDP grouping change anything w.r.t to the above statements in RFC3264?
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