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BIG-IP drops SIP response messages that are missing the Reason-Phrase.
Connectivity issue.
A SIP response message in this format SIP/2.0 424 \r\n are dropped If the message has a reason text Status-Line = SIP-Version SP Status-Code SP Reason-Phrase CRLF Like this SIP/2.0 404 Not Found\r\n then it would not be dropped
None
BIG-IP now accepts SIP response with Status-line missing a reason text.
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