Details of SIP response codes

Hi Experts.

Can anyone share details of SIP response codes?

Admin note: this post was updated with image below.
VoLTE SIP Methods, Response Codes and Details

Check this: VoLTE SIP Methods, Response Codes and Details

Thanks @Tech_Playon.

Can you kindly share some details of ‘480’ response code?

Which resource is temporarily unavailable?

The caller party or calle party?

Is it pertaining to RAN or Core?

In a VoLTE call SIP protocol is used to create, modify and terminate sessions, essentially negotiating a session between two users. SIP does not perform transport layer (delivering data) those are done by RTP/RTCP.

SIP message responses are maintained in an Internet Assigned Numbers Authority (IANA) list called Session Initiation Protocol (SIP) Parameters. They always begin with a response code. These Response Code are divided in following categories:

  • 1XX Codes (Informational/Provisional): These code are for request received and being processed.

  • 2XX Codes (Successful Action) : The action was successfully received, understood, and accepted.

  • 3XX Codes (Redirection): Further action needs to be taken (typically by the sender) to complete the request.

  • 4XX Codes (Client Failure): The request contains bad syntax or cannot be fulfilled at the server.

  • 5XX (Codes Server Failure): The server failed to fulfill an apparently valid request.

  • 6XX (Global Failure): The request cannot be fulfilled at any server

Credits: :point_down: