<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>You cannot do this reliable the way you propose. The only reliable way is to sit behind a PBX/B2BUA that your control and behaves in a consistent and reliable way. Otherwise you are at the mercy at the combinations of the SIP User Agents that are involved in the call transfer operation. </div><div><br></div><div>If you will try to fix incrementally every problem your discover in the SIP Proxy for call transfer you will be busy forever solving this because is end-point implementation dependent.</div><div><br></div><div>Adrian</div><div><br></div><div><br></div><div><div>On Apr 7, 2009, at 6:41 PM, Stanisław Pitucha wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div>Hi,<br>I'm trying to find a solution for using both a dispatcher and attended<br>transfers reliably.</div></blockquote><div><br></div><blockquote type="cite"><div>Standard problems are:<br>- calls from user A must go to the same pbx as all ongoing calls To and From A<br>- dispatcher failover must work properly if there's a record of A's<br>dialog with PBX-1, but PBX-1 goes down<br><br>Issues that make this scenario hard to solve are:<br>- afaik, there's no good way to get the destination of other dialogs,<br>other than a sql query<br>- ds_select_domain doesn't work from failure route, so selecting a<br>"preferred" destination as well as failover routes must be done in the<br>same place<br><br>I made a patch for the dispatcher module that solves that more or less<br>(additional avp decides host to prepend to the list), but it has it's<br>own issues ("preferred" host appears twice in the destinations list,<br>marking bad hosts is probably buggy), so I'm not really happy with<br>that way to solve it.<br><br>Has anyone got a working solution for this problem?<br><br>Thanks,<br>Stan<br><br>_______________________________________________<br>Users mailing list<br><a href="mailto:Users@lists.opensips.org">Users@lists.opensips.org</a><br><a href="http://lists.opensips.org/cgi-bin/mailman/listinfo/users">http://lists.opensips.org/cgi-bin/mailman/listinfo/users</a><br></div></blockquote></div><br></body></html>