I have a few questions regarding rfc 3711:
From the RFC, section 3.3.1:
After a re-keying occurs (changing to a new master key), the rollover
counter always maintains its sequence of values, i.e., it MUST NOT be
reset to zero.
1.
Does re-keying include reinvite session where new keys are allocated?
2.
If ROC is maintained, can I assume full SRTP session is maintained, i.e. RTP sequence + replay lists + SSRC?
Regarding SSRC change during SRTP session:
1.
If a new SSRC arrives should the packet be authenticated with a zero ROC or with the current ROC value?
2.
Assuming authentication succeeds, SRTP session will be reset to zero (Sequence, replay lists ROC etc.)?
Ilan Doron
Media application Team Leader
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