Hi Timo
No we don't have a solution, we looked into it and it needs major changes so we
left it.
Regards
________________________________
From: Timo Bruhn <voip_v...@web.de>
To: nauman762-h...@yahoo.co.uk
Cc: sofia-sip-devel@lists.sourceforge.net
Sent: Wednesday, 14 March 2012, 11:04
Subject: Re: [Sofia-sip-devel] PRACK and 200 OK(INVITE) forking issue
Hi Nauman,
did you find a solution for the problem when forking is combined with PRACK?
Currently we are running into same problems with sofia-sip connecting to a
server that uses forking.
Seems that disabling PRACK and soa engine works. But what if PRACK is required?
Thanks,
Timo
> Hi,
>
> Got a bit further with this, reason that the 200OK ( to INVITE) is being
> discarded is because of this code :
>
> static int nua_invite_client_preliminary(nua_client_request_t *cr,
> int status, char const *phrase,
> sip_t const *sip)
> {
> nua_handle_t *nh = cr->cr_owner;
> nua_dialog_usage_t *du = cr->cr_usage;
> nua_session_usage_t *ss = nua_dialog_usage_private(du);
>
> assert(sip);
>
> if (ss && sip && sip->sip_rseq) {
> /* Handle 100rel responses */
> sip_rseq_t *rseq = sip->sip_rseq;
>
> /* Establish early dialog - we should fork here */
> if (!nua_dialog_is_established(nh->nh_ds)) {
> nta_outgoing_t *tagged;
>
> nua_dialog_uac_route(nh, nh->nh_ds, sip, 1, 1);
> nua_dialog_store_peer_info(nh, nh->nh_ds, sip);
>
> /* Tag the INVITE request */
> tagged = nta_outgoing_tagged(cr->cr_orq,
> nua_client_orq_response, cr,
> sip->sip_to->a_tag, sip->sip_rseq);
> if (tagged) {
> nta_outgoing_destroy(cr->cr_orq), cr->cr_orq = tagged;
> }
> else {
> cr->cr_graceful = 1;
> ss->ss_reason = "SIP;cause=500;text=\"Cannot Create Early Dialog\"";
> }
> }
>
>
> When we get a 183 reliable response Sofia creates an early dialog and creates
> a new tagged INVITE request
>
> if (tagged) {
> nta_outgoing_destroy(cr->cr_orq)
>
> It looks like it marks the original request for destruction, the problem is
> when a 200OK comes in with a different tag, it looks as if its matched
> against the original transaction which is marked for > destruction and so is
> discarded by the code I posted initially in outgoing_recv in nta.c
>
>
> We are handling all media (SDP) ourselves and have set PRACK to be one of the
> methods our app handles. We are using the nua API.
>
> Can Pekka or someone say whether PRACK and forking is supported with the way
> we are using the Stack. We've seen some posts saying there are various bugs.
>
> When PRACK is not used the first 200OK received is passed to the application
> with cancel sent to the others. This is the behaviour we would like even when
> PRACK is used. However it seems > that when the first 183 reliable is
> received this results in subsequent 200OK from other forks to be discarded.
> We just want the first 200OK final response to be passed to our application >
> irrespective of which fork its from and are happy for CANCEL to be sent to
> others.
>
> Any comments most appreciated.
> Thanks
>
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