Hi, I use Wireshark to capture the packages. We can see it in BYE message and its response "200 OK". In the BYE message, the via fields are Via: SIP/2.0/UDP 10.1.2.5;branch=z9hG4bKe282.915fa0b2.0 Via: SIP/2.0/UDP 10.1.2.5:5066;rport=5066;branch=z9hG4bKQXyDHpKjprrDK In its response, they are Via: SIP/2.0/UDP 10.1.2.5;branch=z9hG4bKe282.915fa0b2., SIP/2.0/UDP 10.1.2.5:5066;rport=5066;branch=z9hG4bKQXyDHpKjprrDK We can see in "branch" a "0" is missing, which causes the SIP proxy retransmits BYE again and again. The file in the attachment can be opened by Wireshark.
Best, Zheng Da
sipp
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