Which SIP reason phrase maps to SIP response reason code 181?
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A. B. C. D. E.B.
1xxProvisional Responses 100 Trying Extended search being performed may take a significant time so a forking proxy must send a 100 Trying response.
180 Ringing Destination user agent received INVITE, and is alerting user of call.
181 Call is Being Forwarded Servers can optionally send this response to indicate a call is being forwarded.[ ]:21.1.3 182 Queued Indicates that the destination was temporarily unavailable, so the server has queued the call until the destination is available.
A server may send multiple 182 responses to update progress of the queue.
183 Session in Progress This response may be used to send extra information for a call which is still being set up.
199 Early Dialog Terminated Can be used by User Agent Server to indicate to upstream SIP entities (including the User Agent Client (UAC)) that an early dialog has been terminated.
http://en.wikipedia.org/wiki/List_of_SIP_response_codes http://en.wikipedia.org/wiki/List_of_SIP_response_codesThe SIP response reason code 181 is used to indicate that the call is being forwarded. This means that the call is not being answered at the originally dialed destination, and is instead being forwarded to another destination.
The SIP reason phrase that maps to this response code is "Call is Being Forwarded", as listed in answer option B.
To understand this better, let's take a look at the different components of a SIP response message.
A SIP response message consists of a response code and a reason phrase. The response code is a three-digit number that indicates the status of the request made by the SIP client. The reason phrase is a human-readable description of the response code, and is meant to provide more information about the status of the request.
In the case of response code 181, it indicates that the call is being forwarded. This could happen for a number of reasons, such as when the original recipient is unavailable, busy, or has explicitly set up call forwarding on their device.
The reason phrase "Call is Being Forwarded" provides additional information about the status of the call. This phrase is typically displayed to the user or administrator, and can be used to diagnose call issues or to provide feedback to the user.
To summarize, the SIP response reason code 181 indicates that the call is being forwarded, and the reason phrase that maps to this response code is "Call is Being Forwarded", as listed in answer option B.