When Asterisk sends a re-invite initiating T.38 faxing and the endpoint responds with a m=image line and zero port, a crash will occur in Asterisk. This is a re-occurrence of AST-2019-004.
d43d5cb9a0201ce6df31db1a1a9561360db4a1bb17c19f46dd04be62c2e79557Asterisk Project Security Advisory - 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.
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