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????1???????Response??

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????2??2XX?????????????????????????????????????????

????3??3XX??????????????????????????????????

????4??4XX??????????????????????а?????????????????????????????????

????5??5XX?????????????????????????????????

????6??6XX?????????????κη????????????????

????100?????????????????

????180?????壬UA???INVITE?????????????????????????????????????????????

????181????????????

????182?????

????183????????

????200??OK

????300????Э?鯔????:???????е????????????Э?鯔???á?

????301???????????????:???????е???????????????????á?

????302????Э?鯔????:???????е????????????Э?鯔???á?

????303?????λ??????:???????е?????????????????λ???????

????304y???????????:????????е????????y??????????á?

????305y??????????:????????е????????y?????????á?

????306y?????????????:????????е????????y??????????????

????307??????????????????:???????????????????????????

????330?鰣??????:??????????鰣??

????331??????????:???????????????(??????????????????)??

????370???????:????????ж???????y?嶨?????????????????

????399???澯:??澯??????????????????????????澯?????????????κ???????????