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Fallback from SRTP to RTP due to bandwidth limitation or change in call toplogy, such as a media server not supporting SRTP and application of music-on-hold.
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Upgrade from RTP to SRTP.
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Conversion from RTP to SRTP between the originating and terminating legs after failover.
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Modification of keys using REINVITE.
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Fallback from RTP to SRTP after failover.