SIP transactions and dialogs
It is important to understand the difference between a transaction and dialog because we will use this ahead in OpenSIPS scripting. For example, there are attribute value pairs attached to transactions and dialog variables attached to dialogs. If you can't recognize a dialog and variable, it will be hard to configure the SIP server.
A transaction occurs between a user agent client and server and comprises of all the messages from the request to the final response (including all the interim responses). The responses can be provisional, starting with one followed by two digits (for example, 180 Ringing) or final, starting ...
Get Building Telephony Systems with OpenSIPS - Second Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
