[Kamailio-Users] 30x Redirect / Forward, even questions
Daniel-Constantin Mierla
miconda at gmail.com
Wed Jan 13 12:44:47 CET 2010
Hello,
On 1/11/10 1:56 PM, Samuel Muller wrote:
> Hello all,
>
> I've questions 'bout the redirect/forward with 30x requests.
>
> Actually, it does not work, it seems the uac redirect module doesn' t
> use the new contact for the new invite.
>
> simple schema : pstn gw -> kamailio -> linksys -> call forward
> unconditionnal to another pstn number -> kamailio -> gw pstn
>
> the 302 as seen with ngrep tool :
>
> #SIP/2.0 302 Moved Temporarily.
> #To: <sip:B at sip_proxy;user=phone>;tag=91515579fff6b8d1i0.
> #From: <sip:A at pstn_gw1;user=phone>;tag=16627-UI-00020cf3-54eea92c4.
> #Call-ID: 16627-RO-00020cf2-4186e9762 at pstn_gw1.
> #CSeq: 81990 INVITE.
> #Via: SIP/2.0/UDP sip_proxy;branch=z9hG4bK0f0c.22989b87.1.
> #Via: SIP/2.0/UDP
> pstn_gw1:5060;rport=5060;received=ip_pstn_gw1;branch=z9hG4bK-25EA-243F3.
> #Record-Route:
> <sip:sip_proxy;lr=on;ftag=16627-UI-00020cf3-54eea92c4;did=f65.bcc44f06>.
> #Contact: <sip:C at sip_proxy>.
> #Diversion: "B" <sip:B at sip_proxy>;reason=unconditional.
> #Server: Linksys/SPA942-6.1.3(a).
>
> DBG:uac_redirect:shmcontact2dset: adding contact <sip:C at sip_proxy>
> dest set : Contact: sip:B at ip_B, <sip:C at sip_proxy>;q=0.01
> contact $ct: <sip:pstn_gw1:5060>
>
> the second pstn gateway received a request to B, and not C (so it
> creates a loop through pstn ...).
>
> in my config :
>
> loadmodule "uac.so"
> modparam("uac", "rr_store_param", "vsf")
> modparam("uac", "from_restore_mode", "auto")
>
> loadmodule "uac_redirect.so"
> modparam("uac_redirect", "default_filter", "accept")
> modparam("uac_redirect","bflags", 1)
>
> loadmodule "diversion.so"
>
> failure_route[2]
> {
> setdebug(4);
>
> if (t_check_status("301|302"))
> {
> route(26) # acc fwd
> $avp(s:acc_status) = "cfu";
>
> if (!get_redirects("2:1"))
> {
> xlog("L_NOTICE", "failed to extract contact
> info from 30x header");
> route(10); # stop rtp
> t_reply("480", "Temporarily Unavailable");
> exit;
> }
>
> # flag 3xx status, open a new branch and back to find
> the new callee
> setflag(28);
> append_branch();
> t_on_branch("1");
> route(3); # search the new callee
> setdebug();
> exit;
> }
>
> t_on_branch("1");
> setdebug();
> route(3); # find callee
> route(12); # local outbound
> route(10); # stop rtp
> }
>
> I'm using lcr module to route calls, kamailio v. 1.5.3.
>
> I've another question, is the 30x always considered as a failure_route ?
>
> Any help and/or explanations about the tricks would be really
> appreciated ... thanks,
as I can see from you comments, in failure_route you get the contacts
from 30x and append branch then call route(3) which is find callee --
what is that, is it appending another branch? Practically after append
branch you should just do relay.
Cheers,
Daniel
--
Daniel-Constantin Mierla
* http://www.asipto.com/
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