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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoPlainText>Hi, everybody,<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>I want to implement the supplementary service, call transfer unconditional/busy/NoAnswer through SIP in Asterisk. <o:p></o:p></p><p class=MsoPlainText>Does asterisk also already support it? What's the supported sip message flow?<o:p></o:p></p><p class=MsoPlainText>How should I configure the sip.conf or extensions.conf?<o:p></o:p></p><p class=MsoPlainText>I tried this way in extensions.conf, but there is no 181 message is sent to calling party, which is expected as below picture. <o:p></o:p></p><p class=MsoPlainText>exten => 1010,1,Dial(SIP/1001); CFU 1010-->1001.<o:p></o:p></p><p class=MsoPlainText><img width=272 height=491 id="Picture_x0020_1" src="cid:image001.png@01CE0BD3.3FCD7EC0"><o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoPlainText>Thanks.<o:p></o:p></p><p class=MsoPlainText>Ding Peng<o:p></o:p></p></div></body></html>