As I said, the BYE in early phase is ok, when willing to end a specific branch, but typically after 183 which establishes a connected brach for early media. Maybe the BYE was sent in this case because of the Contact in 180, thinking that was an established branch. That was the reason I decided to skip adding the Contact in the response sent out if the incoming one does not have one.

Maybe you have the chance to test and see if the BYE is still sent when no Contact is in 180.

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