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The Issue
RFC 3261 did not define a way to be able to migrate to new body types in offer/answer
Multiple vendors are implementing SRTP and need a way to offer both secure offers and offers that are backwards compatible
Wireless folks want to pick multicast/unicast offers?
We need to close this issue soon or we will have a huge incompatibility issue in the future

We have been discussing this problem since Aug 2003

So far, two solutions have been proposed: one that might work and one that doesn’t work
PPT Version