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480 Temporarily Unavailable Callee currently unavailable. [1]: §21.4.18 481 Call/Transaction Does Not Exist Server received a request that does not match any dialog or transaction. [1]: §21.4.19 482 Loop Detected Server has detected a loop. [1]: §21.4.20 483 Too Many Hops Max-Forwards header has reached the value '0'. [1]: §21.4.21
The server either does not recognize the request method, or it lacks the ability to fulfil the request. Usually this implies future availability (e.g., a new feature of a web-service API). 502 Bad Gateway The server was acting as a gateway or proxy and received an invalid response from the upstream server. 503 Service Unavailable
Service ready for new user. 221: Service closing control connection. Logged out if appropriate. 225: Data connection open; no transfer in progress. 226: Closing data connection. Requested file action successful (for example, file transfer or file abort). 227: Entering Passive Mode (h1,h2,h3,h4,p1,p2). 228: Entering Long Passive Mode (long ...
The network elements that use the Session Initiation Protocol for communication are called SIP user agents. Each user agent (UA) performs the function of a user agent client (UAC) when it is requesting a service function, and that of a user agent server (UAS) when responding to a request. Thus, any two SIP endpoints may in principle operate ...
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During large file transfers, the control connection may remain idle. An ALG can prevent the control connection getting timed out by network devices before the lengthy file transfer completes. [3] Deep packet inspection of all the packets handled by ALGs over a given network makes this functionality possible. An ALG understands the protocol used ...
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