[SR-Users] Routing dialogs (INVITE) from Lua

[Daniel-Constantin Mierla]

Hello,

On 18.10.21 06:08, Emilio Panighetti wrote:
> Hello,
>
> Based on kamailio-basic-kemi.cfg and kamailio-basic-kemi-lua.lua,
> I’m trying to get a simple test to go through using SIPp built-in UAC
> and UAS scenarios, using LUA config:
>
> Commented out all the registration blocks and trying to run a simple
> proxy for now, but I can’t seem able to change the URI.
>
> SIPp UAC: 192.168.1.12:5060
> SIPp UAS: 192.168.1.12:5062
> Kamailio 5.5.2: 192.168.15.:5060
>
> Part of the Kamailio.lua config:
>
> -- wrapper around tm relay function
> function ksr_route_relay()
> -- enable additional event routes for forwarded requests
> -- - serial forking, RTP relaying handling, a.s.o.
> if KSR.is_method_in("IBSU") then
> if KSR.tm.t_is_set("branch_route")<0 then
> KSR.dbg("EP: ksr_route_relay Set for branch_route\n");
> KSR.tm.t_on_branch("ksr_branch_manage");
> end
> end
> if KSR.is_method_in("ISU") then
> if KSR.tm.t_is_set("onreply_route")<0 then
> KSR.dbg("EP: ksr_route_relay Set for onreply_route\n");
> KSR.tm.t_on_reply("ksr_onreply_manage");
> end
> end
> if KSR.is_INVITE() then
> if KSR.tm.t_is_set("failure_route")<0 then
> KSR.dbg("EP: ksr_route_relay Set for failure\n");
> KSR.tm.t_on_failure("ksr_failure_manage");
> end
> end
> if KSR.tm.t_relay()<0 then
> KSR.dbg("EP: ksr_route_relay Set for reply_error\n");
> KSR.sl.sl_reply_error();
> end
> -- EP: Base route
> KSR.dbg("EP: ksr_route_relay Check for Base Route\n");
> if KSR.is_INVITE() then
> KSR.dbg("EP: ksr_route_relay Base Route (DU)\n");
> --KSR.sl.send_reply("503", "Debug");
> KSR.setdsturi("sip:192.168.1.12:5062 <sip:192.168.1.12:5062>");
> KSR.pv.sets("$du", "sip:192.168.1.12:5062 <sip:192.168.1.12:5062>");
> end
> KSR.dbg("EP: ksr_route_relay exit\n");
> KSR.x.exit();
> end
>
> What’s happening here is that instead of forwarding the INVITE to the
> SIPp UAC, it creates a loop. Tried KSR.setdsturi() only (KSR.pv.sets
> commented out) and it’s still the same.
> If I comment out the 503 reply, then that’s what the UAC gets back.

You have to set dst uri before KSR.tm.relay(), because that's the
function that sends to the next hop. If you set it after it, then it is
not used.

Cheers,
Daniel


[...]

-- 
Daniel-Constantin Mierla -- www.asipto.com
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