What is SIP Transaction? - Omid-Mohajerani/Learn-Kamailio GitHub Wiki

SIP Transaction Definition in SIP RFC 3261

What I understand:

• SIP transaction consists of a single request and any responses to that request.
• In case the request was an INVITE, the transaction also includes the ACK if the final response is not a 2xx response.

So how many SIP transactions do we have here? This is a basic call flow that we dont authenticate SIP invites.( not the normal case usually)

What about this one?