13 Jan
2010
13 Jan
'10
1:44 p.m.
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@sip_proxy;user=phone>;tag=91515579fff6b8d1i0.
#From: <sip:A@pstn_gw1;user=phone>;tag=16627-UI-00020cf3-54eea92c4.
#Call-ID: 16627-RO-00020cf2-4186e9762@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@sip_proxy>.
#Diversion: "B" <sip:B@sip_proxy>;reason=unconditional.
#Server: Linksys/SPA942-6.1.3(a).
DBG:uac_redirect:shmcontact2dset: adding contact <sip:C@sip_proxy>
dest set : Contact: sip:B@ip_B, <sip:C@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/