DP: 掛斷時傳回指定的 SIP response code
內容表格
沒有標頭範例：
exten => s-BUSY,1,Noop(Dial failed due to trunk reporting BUSY - giving up) ;exten => s-BUSY,n,Noop(Hangup the call and Return SIP response 603 'Declined' to the caller) ;exten => s-BUSY,n,Hangup(26) ;exten => s-BUSY,n,Noop(Hangup the call and Return SIP response 403 'Forbidden' to the caller) ;exten => s-BUSY,n,Hangup(21) ;exten => s-BUSY,n,Noop(Hangup the call and Return SIP response 502 'Bad Gateway' to the caller) ;exten => s-BUSY,n,Hangup(27) exten => s-BUSY,n,Noop(Hangup the call and Return SIP response 500 'Server internal failure' to the caller) exten => s-BUSY,n,Hangup(38)
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