SIP回复消息对应内容

    /* 1xx  */
       (100)==Trying;
       (180)==Ringing;
       (181)==Call Is Being Forwarded;
       (182)==Queued;
       (183)==Session Progress;
    /* 2xx */
        (202)== Accepted;
        (else)==  OK;
     /* 3xx */
       (300)==Multiple Choices;
       (301)==Moved Permanently;
       (302)==Moved Temporarily;
       (305)==Use Proxy;
       (380)==Alternative Service;
   /* 4xx */
       (400)==Bad Request;
       (401)==Unauthorized;
       (402)==Payment Required;
       (403)==Forbidden;
       (404)==Not Found;
       (405)==Method Not Allowed;
       (406)==Not Acceptable;
       (407)==Proxy Authentication Required;
       (408)==Request Timeout;
       (409)==Conflict;
       (410)==Gone;
       (411)==Length Required;
       (413)==Request Entity Too Large;
       (414)==Request-URI Too Large;
       (415)==Unsupported Media Type;
       (416)==Unsupported Uri Scheme;
       (420)==Bad Extension;
       (480)==Temporarily not available;
       (481)==Call Leg/Transaction Does Not Exist;
       (482)==Loop Detected;
       (483)==Too Many Hops;
       (484)==Address Incomplete;
       (485)==Ambiguous;
       (486)==Busy Here;
       (487)==Request Terminated;
       (488)==Not Acceptable Here;
       (489)
        (else)==  Bad Event;
    /* 5xx */
       (500)==Internal Server Error;
       (501)==Not Implemented;
       (502)==Bad Gateway;
       (503)==Service Unavailable;
       (504)==Gateway Time-out;
       (505)==SIP Version not supported;
   /* 6xx */
       (600)==Busy Everywhere;
       (603)==Decline;
       (604)==Does not exist anywhere;
       (606)==Not Acceptable;
 



 
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