t_uac_dlg returns final response to the initiated request. I don't know if it really waits for the response or uses some kind of async callback.
On Friday 01 October 2010, Alex Balashov wrote: > Sergey, > > On 10/01/2010 06:11 PM, Sergey Okhapkin wrote: > > There is a way, t_uac_dlg MI does that. I wonder why something similar is > > not available from cfg script. You can issue http request and wait for > > response from cfg, it would be nice to have t_uac_dlg() script function > > too. > > You can send a request from script, sure. That's what uac_req_send() > does; t_uac_dlg is just its MI equivalent, allowing that action to be > externally stimulated. Unless I am missing something that is not in > the documentation, t_uac_dlg does not wait for a reply either. Or > does it? I have not used it. > > > I have no problem to run apache and invoke t_uac_dlg from CGI, but I'd > > prefer to avoid cgi overhead and implement kamailio-only based solution. > > Understandably. However, generally speaking, the architecture of > Kamailio, and the entire *SER technology stack, is patterned after a > strictly (external) event-driven process. This means that route > script is invoked only when messages are received; some state > information can be retained across sets of related messages > (transactions, dialogs, etc.), but in principle, Kamailio does not sit > around and block, waiting for replies to come back. > > Given the present architecture, waiting on a response would be > additionally problematic because Kamailio/sip-router does not use > threads per se. It spawns a set of forked processes which act as > worker threads that are specialised into different roles, but these > are finite in nature. It would be catastrophic to throughput to have > one of these pause and block, waiting on a reply before returning from > an invocation of route script for a given message. > _______________________________________________ SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list sr-users@lists.sip-router.org http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users