After ZRTP negotiation is complete (the ZRTP state machine has entered the
"secure" state), I get a number of lines in the log as follows (FreeSWITCH
rev. 13501):

2009-05-29 16:43:19 [DEBUG] switch_rtp.c:538 zrtp_logger()  [zrtp protoco]:
ERROR! Decrypt failed. ID=14:DH s=SRTP authentication failure (RTP size=172
ssrc=2760088424 seq=53043/53043 pt=9)

They all have a time stamp of shortly after the end of the protocol
negotiation.

Is this normal, or a sign of trouble?

The call itself is fine, and ZRTP does not leave the secure state until the
end of the call:
2009-05-29 16:43:30 [DEBUG] switch_rtp.c:538 zrtp_logger()  [ zrtp engine]:
STOP STREAM ID=14 mode=DH state=SECURE.

Are others seeing similar behaviour?


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