Hi Rodrigo,
Just trying to understand the flow here - could it be actually a
Re-INVITE that goes through your sequential routing block, thus lookup()
is not called, leaving $avp(attr) NULL throughout that transaction?
Regardless of the above, in OpenSIPS terms, each "branch" points to a
different destination. In our case, we're talking about a retry, not a
serial/parallel forked call. Which means that you should only bother
with $T_branch_idx if a lookup() could yield more than one device to be
contacted for the same AoR.
Best regards,
Liviu Chircu
OpenSIPS Developer
http://www.opensips-solutions.com
On 29.08.2017 18:05, Rodrigo Pimenta Carvalho wrote:
Dear SIPusers,
In my project I use to keep a valuable information in table location.
This is about the state of a subscriber's localization.
I have to read such information for the callees, every time a new
branch is created and every time a INVITE is answered with SIP OK.
So, my OpenSIPS configuration has something similar to the following code:
1 route{
2 ... // hidden code for simplification.
3 lookup("location","m")
4 ...
5 route(relay);
6 }
7 route[relay]{
8 if (is_method("INVITE")) {
9 ...
10 t_on_branch("per_branch_ops");
11 t_on_reply("handle_nat");
12 t_on_failure("missed_call");
13 }
14 ...
15 }
16 branch_route[per_branch_ops] {
17 ....
18 $(avp(attr)[$T_branch_idx])
19 ...
20 }
21 onreply_route[handle_nat] {
22 ...
23 $(avp(attr)[$T_branch_idx])
24 ...
25 }
26 ...
In a determined call, when the OpenSIPS receives the INVITE and then a
SIP OK (200), the code gets right value in lines 18 and 23.
In such call, the SIP OK (from callee) offers a kind of video that the
caller can't support. In this case the caller sends another SIP INVITE
with inactive video (SDP).
In this moment, OpenSIPS gets this second INVITE and create a new branch.
However, for this new branch, lines 18 and 23 give me NULL for
$(avp(attr)[$T_branch_idx]).
How to solve this issue?
Any hint will be very helpful!!
Best regards!
P.S.: I'm not expert in SIP.
RODRIGO PIMENTA CARVALHO
Inatel Competence Center
Software
Ph: +55 35 3471 9200 RAMAL 979
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