Backtrack:  
 
by lunarg on October 22nd 2020, at 16:52

When troubleshooting VoIP, it is useful to know the most common responses in SIP messages. Similarly to HTTP, each response to a request contains a response code indicating the status/result of the request. A list of the most common response codes is found here:

https://www.3cx.com/pbx/sip-responses/