Outline of connected processing of SIP used with VoIP net

Hello I think that today's material goes with SIP. Well, because the knowledge of SIP has the part that is already common sense in the network industry and the telecom industry, the chief telecommunications engineer's examination knows the minimum any more though thinks the problem of SIP to be frequent occurrence. It is not the one that today's material judges "Corrections of sentences" as usual, and it is good ..only reading for the time being... If it doesn't have it, knowledge at today's problem level doesn't become work though it is a request substantially message of SIP ･･･ It is not likely to be able to use, and even the packet capture doesn't understand the meaning as the protocol analyzer is also satisfactory. Then, today's material is [kochira] ↓↓.



- Outline of connected processing of SIP used with VoIP net



The message of SIP includes request (demand) message and response (response) messages. As for the request message, six kinds are standardized by RFC3261 among these.
- There is request (demand) message and response (response) message = messages of SIP.



The request message of SIP is said 【 method 】 in general, and the main usage is as follows.
- In general, the request message of SIP is said 【 method 】.



A:　INVITE is the first request message used to establish the session between user agent.
- The first request message used to establish the session between INVITE = user agent



B:　【ACK】 is a request message used to confirm the response message to INVITE was received, and the media session can be established by 【ACK】 for the communication.
- 【ACK】 In the request message used to confirm the response message to = INVITE was received, the media session can be established by 【ACK】 for the communication.



C:　BYE can be sent from either the caller or the receiver by the request message used to end the set media session.
- It is possible to send it from either the caller or the receiver by the request message used to end the media session BYE = set.



D:　CANCEL corresponds to breaking the connection before the other party responds when calling it before the media session is established by the request message used to discontinue setting.
- It corresponds to breaking the connection before the other party responds when calling it before the media session is established CANCE L = by the request message used to discontinue setting.



E:　When the user agent registers 【URI】 that is my location information (location information) and Internet Protocol address to the SIP network, RESISTER is used.
- When RESISTER = user agent registers 【URI】 that is my location information (location information) and Internet Protocol address to the SIP network, it is used.



F:　When the user agent inquires the ability and the state to other user agent and 【 proxy 】 server, OPTIONS is used.
- When OPTIONS = user agent inquires the ability and the state to other user agent and 【 proxy 】 server, it is used.



Well, how though this blog is not considerably seen easily because the frame is small? A person not good at the SIP related problem : sleeping ..study hard.. then around here today because there might be a hindrance also in the business not to mention the examination if it doesn't come to be able to judge the state by seeing CallSequence though it was a problem of the SIP request message.