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SIP is based on request/response transactions. Each transaction consists of a SIP request and at least one response. SIP requests and responses may be generated by any SIP user agent; User Agent Clients (UACs), which initiate requests, and User Agent Servers (UASes), which respond to them. Created: July 2018 Permalink: https://confluencewildix.wildixatlassian.comnet/wiki/x/KAeIAQoxvOAQ |
Table of Contents
1xx - Provisional Responses
- 100 Trying
Extended search being performed may take a significant time so a forking proxy must send a 100 Trying response.
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Can be used by User Agent Server to indicate to upstream SIP entities (including UAC) that an early dialog has been terminated.
2xx - Successful Responses
- 200 OK
Indicates the request was successful.
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Indicates the request was successful, but the corresponding response will not be received.
3xx - Redirection Responses
- 300 Multiple Choices
The address resolved to one of several options for the user or client to choose between, which are listed in the message body or the message's Contact fields.
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The call failed, but alternatives are detailed in the message body.
4xx - Client Failure Responses
- 400 Bad Request
The request could not be understood due to malformed syntax.
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The server has received a request that requires a negotiated security mechanism, and the response contains a list of suitable security mechanisms for the requester to choose between, or a digest authentication challenge.
5xx - Server Failure Responses
- 500 Server Internal Error
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The server is unable or unwilling to meet some constraints specified in the offer.
6xx - Global Failure Responses
- 600 Busy Everywhere
All possible destinations are busy. Unlike the 486 response, this response indicates the destination knows there are no alternative destinations (such as a voicemail server) able to accept the call.
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The called party did not want this call from the calling party. Future attempts from the calling party are likely to be similarly rejected.
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