Hi Experts.
Can anyone share details of SIP response codes?
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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:
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1XX Codes (Informational/Provisional): These code are for request received and being processed.
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2XX Codes (Successful Action) : The action was successfully received, understood, and accepted.
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3XX Codes (Redirection): Further action needs to be taken (typically by the sender) to complete the request.
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4XX Codes (Client Failure): The request contains bad syntax or cannot be fulfilled at the server.
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5XX (Codes Server Failure): The server failed to fulfill an apparently valid request.
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6XX (Global Failure): The request cannot be fulfilled at any server
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