I would like understand the SIP call flow. When I was reading SRND and other forum article about SIP I was notified that UPDATE message is to send if something is update in the call flow like codec or payload etc.
I looked into some UPDATE messages but can't understand what I exactly says.
Example a call flow between a CUCM and SME.
SME send a update and CUCM send a 200 OK.
What exactly that we can see in UPDATE to understand what's really going on.
UPDATE message as per RFC can be used to modify media related parameters in early dialog since RE-INVITE can be used only once dialog has been confirmed. So if there is any need to initiate second offer-answer during early dialog, UPDATE can be used. Please note that you can use UPDATE in confirm dialog as well.
You can refer RFC 3311 for more detailed call flow.
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