[SIPForum-discussion] No ACK
zhangn4037 at sohu.com
zhangn4037 at sohu.com
Wed Jun 20 05:09:51 UTC 2007
<p>Hello,</p><p>Many thanks for your help.</p><p>Indeed, ACK can not be the response of INFO, now I just want to check why there is no ACK for </p><p>the secondary INVITE. You see, subscriber A with callwaiting call B, after the conversation established, subscriber</p><p>C call A, UA will send INVITE to proxy, proxy will response 100,180,200. but after the 200 for the INVITE send out</p><p>from proxy, there is no ACK send out from UA. Perhaps there are some error or some header missed in the 200 </p><p>response.</p><p>B R,</p><p> </p><blockquote dir="ltr" style="padding-right: 0px; padding-left: 5px; font: 9pt 宋体; margin-left: 10px; border-left: #000000 2px solid; margin-right: 0px"><div style="font-weight: normal; font-size: 9pt; line-height: normal; font-style: normal; font-variant: normal">----- Original Message -----</div><br /><strong>From:</strong> <a href="mailto:kunusan at yahoo.com">badal naik</a> <br /><strong>To:</strong> <a href="mailto:zhangn4037 at sohu.com">zhangn4037 at sohu.com</a> <br /><strong>Subject:</strong> Re: [SIPForum-discussion] No ACK<br /><strong>Sent:</strong> Wed Jun 20 12:10:07 CST 2007<br /><p><br /><br /><br /><br />Hello Friend,<br />what I infer from your mail is that you are expecting<br />a ACK message for INFO that is send as re-invite.In<br />fact this is against the ethics of SIP standards.<br />ACK is never sent to Info message.<br />After a session is established with(Invite->200<br />OK->ACK), Info message is sent with confirmation 200<br />OK.<br />Never expects ACK message.<br /><br />Hope this will help you out.If you are seeking diff<br />things please let me know.<br /><br />--- <a href="mailto:zhangn4037 at sohu.com">zhangn4037 at sohu.com</a> wrote:<br /><br />> </p><blockquote dir="ltr" style="padding-right: 0px; font: 9pt 宋体; border-left: #000000 2px solid; br: 5px"><p> Hello all,</p><p> Now I meet a<br />> wondering issue, when I edit a 200 response and<br />> send to UAC, there is no ACK send<br />> out.</p><p> First of a
ll, let me introduce the<br />> test platform:</p><p> the software ack as<br />> proxy, it can receive and send out SIP message, we<br />> use it to test the protocol conformance of <br />> </p><p> SIP UA. I have done the SIP basic call<br />> message flow, but when I try to simulate the call<br />> waiting message flow, I </p><p> meet this<br />> issue, after INFO with flashhook event report to<br />> proxy, the proxy send the 200 response for the<br />> secondary</p><p> INVITE request, but I find<br />> there is no ACK send out from UA. I doubt there are<br />> some error in the 200 response, Could<br />> </p><p> you please help me to check it.<br />> Attachment is the ethereal capture, the no.24<br />> message is the targ!<br />> et.</p><p> Thanks,</p><p> B<br />> R,</p><p> </p><p> </p><p><br />/> </p></blockquote>><br />_______________________________________________<br />> This is the SIP Forum discussion mailing list<br />> TO UNSUBSCRIBE, or edit your delivery options,<br />> please visit<br />> <a href="http://sipforum.org/mailman/listinfo/discussion">http://sipforum.org/mailman/listinfo/discussion</a><br />> Post to the list at <a href="mailto:discussion at sipforum.org">discussion at sipforum.org</a><br />> <br /><br /><br /><br /> <br />____________________________________________________________________________________Ready for the edge of your seat? <br />Check out tonight's top picks on Yahoo! TV. <br /><a href="http://tv.yahoo.com/">http://tv.yahoo.com/</a><br /></blockquote>
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