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Fixes the following security issues: AST-2019-004: Crash when negotiating for T.38 with a declined stream When Asterisk sends a re-invite initiating T.38 faxing, and the endpoint responds with a declined media stream a crash will then occur in Asterisk. https://downloads.asterisk.org/pub/security/AST-2019-004.pdf AST-2019-005: Remote Crash Vulnerability in audio transcoding When audio frames are given to the audio transcoding support in Asterisk the number of samples are examined and as part of this a message is output to indicate that no samples are present. A change was done to suppress this message for a particular scenario in which the message was not relevant. This change assumed that information about the origin of a frame will always exist when in reality it may not. https://downloads.asterisk.org/pub/security/AST-2019-005.pdf Signed-off-by: Peter Korsgaard <peter@korsgaard.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>