12 Feb
2018
12 Feb
'18
7:55 p.m.
I have this scenario
Customer --> Kamailio --> Provider1
The route where l route the call to Provider1 is called route["INCOMING"] and I
"arm" the replies and failures to : t_on_reply("INCOMING") and
t_on_failure("INCOMING"). Provider1 always replies with a 302 Redirect and in
the failure_route["INCOMING'] I have this code:
if (t_check_status("302")) {
get_redirects("*");
t_on_branch("REDIRECT_BRANCH");
t_load_contacts();
t_next_contacts();
t_on_failure("SERIAL_FORKING");
t_relay();
exit;
}
In the t_on_failure("SERIAL_FORKING") block I do t_relay() as long as there are
more contacts to be processed. Lets say I need to try Provider_2 and Provider_3
failure_route["SERIAL_FORKING"]
{
xlog("L_INFO","mylog: In Failure Route SERIAL_FORKING. Reply
[$rs]\n");
if (!t_next_contacts()) {
exit;
}
xlog("L_INFO","mylog: In Failure Route SERIAL_FORKING. Trying next
Contact.\n");
t_on_failure("SERIAL_FORKING");
t_relay();
}
I want to use RTPProxy in this scenario and I am using the function rtpproxy_manage() to
let kamailio handle it automatically.
RTPProxy
↑
|
|
Customer --> Kamailio --> Provider1
|
|
↓
Provider N
After the 302 response is processed I would like to have the signaling flow "Customer
-> Kamailio --> ProviderN" and the RTP flow "Customer --> RTPProxy
--> ProviderN"
I have tried inserting the function in several places but can't make it work and what
I mean is that sometimes the rtpproxy creates the 1st session and then deletes it as soon
as I call it the 2nd time with a message similar to this one (log of rtpproxy) :
"INFO:416f20b74a58fb75168175e61b2edece@192.168.1.61:5060:rtpp_cmd_delete_ematch:
forcefully deleting session 1 on ports 63502/0". Sometimes the kamailio log shows
this message: "ERROR: rtpproxy [rtpproxy.c:2536]: force_rtp_proxy(): incorrect port 0
in reply from rtp proxy"
I think I must call rtpproxy_manage() before I send the INVITE to each of the Providers in
the Contact list so they receive a SDP offer with an IP:Port combination provided by the
RTPProxy (instead of the ones coming from the Customer). That would be in my
route["INCOMING']
Then once Provider_N replies with a 183 with SDP or a 200 OK I would call it again to get
a new session to be passed on the reply to my customer. But is the part I am struggling
with. Should I add a new reply route inside the failure_route["INCOMING'] only if
I am dealing with 302 and do it there ?
I am out of ideas guys and any idea is welcome