[SR-Users] how does rtjson work?

[Syed Shahryar]

My use case is such that I want to be able to send a SIP MESSAGE destined
for a single username to multiple users. In order to be able to map that
target username to multiple usernames, I tried using rtjson and evapi/http
(to generate the routing json), but none of them worked.

Is it the right approach? Is there any other way to programmatically
generate multiple targets for SIP request? I am familiar with dynamic
routing but I need more flexibility.

Initially, I tried sending the request to a different username but that
didn't work and got the following message in the http async result route.

kamailio    | 19(25) ERROR: nathelper [nathelper.c:1461]: sdp_1918():
Unable to parse sdp body
kamailio    | 19(25) NOTICE: <core> [core/kemi.c:124]:
sr_kemi_core_notice(): In evapi msg branch
kamailio    | 28(34) NOTICE: {2 6661 MESSAGE q6hikd6tumsr1dh35kvj} <core>
[core/kemi.c:124]: sr_kemi_core_notice(): In evapi reply branch

The message was received on the originally requested to user and also $tu still
points to the original user instead of the new user even after executing
the following code.

KSR.rtjson.init_routes(response);
KSR.rtjson.push_routes();
KSR.nathelper.fix_nated_contact();

In http response, I receive the following and don't see any rtjson errors
when init_routes is executed on it.

{"version":"1.0","routing":"parallel","routes":[{"headers":{"from":{"display":"test_1","uri":"sip:
*test_1*@test.com:9908"},"to":{"display":"test_4","uri":"sip:*test_4*@
test.com:9908
"},"extra":""},"branch_flags":8,"fr_timer":5000,"fr_inv_timer":30000}]}

Please note that the request was sent to *test_2*@test.com. I have tried
other combinations of above but nothing works.

I have already searched on Google and read relevant articles and blog
posts.

Thanks
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