SIP Kamailio Examples Configurations and Lua scripts for the roles Kamailio can play

Stateful Kamailio Server with Lua prigramming and RTP engine integration

Kamailio is basically only a transaction stateful proxy, without any dialog support build in. To make it stateful , we add dialog support that provides awareness, like storing the information in the dialog creation stage, that can be used during the whole dialog existence.

Route headers Record additional dialog-related information in the routing set (Record-Route/Route headers) headers They show up in all sequential requests. Applications are found in NAT traversal

Install

make include_modules="app_lua xmlrpc json" cfg
sudo make all
sudo make install

conventions

– KSR - the new dynamic object exporting Kamailio functions (kemi) – sr - the old static object exporting Kamailio functions

Run

kamailio -f kamailio_lua.cfg -Ee

RTPengine from dbtext

1:1:udp\:<ip>\:<port>:1:0:0

UAC

simulate a UAC to send calls to Kamailio SIP server and RTP engine proxy

sipp -sn uac -d 80000 -s altanai <sipserverip:port> -i <uacip>  -m 1 -rp 1 -max_retrans 1

Dispatcher in kamailio

Add the destination details in dispatcher list on kamailip SIP sever

1 sip:<uasip:port> 0 0 0

UAS

Simulate a UAS to receive calls from kamailio SIP server and RTP Engine rpoxy

sipp -sn uas -i <uasip> -p <uasport> -trace_err -aa

-aa to automate handling of SIP INFO, OPTIONS, NOTIFY etc with 200 ok

Debugging

Issue1 RTP engine not acessible or found 4(95144) INFO: [core/kemi.c:150]: sr_kemi_core_log(): response contains sdp, answer to rtpengine 4(95144) ERROR: rtpengine [rtpengine.c:2928]: select_rtpp_set(): no rtpp_set_list->rset_first 4(95144) ERROR: rtpengine [rtpengine.c:3138]: select_rtpp_node(): script error - no valid set selected 4(95144) ERROR: rtpengine [rtpengine.c:2562]: rtpp_function_call(): no available proxies 4(95144) ERROR: [core/kemi.c:156]: sr_kemi_core_log(): received failure reply for rtpengine answer from instance **Solution** Either find a publically or self accessible rtpengine or download source and build your own manaully

git clone git@github.com:sipwise/rtpengine.git
 cd rtpengine

dependencies like openssl

export PKG_CONFIG_PATH="/usr/local/opt/openssl@1.1/lib/pkgconfig"
brew link openssl

or if openssl isnt found then

brew reinstall openssl@1.1

hiredis

brew install hiredis

spandsp

brew install spandsp

libiptc library for iptables management

brew install libiptcdata

for sys/epoll.h

brew install libuv

tbd working on epoll on mac osx

fatal error: 'sys/epoll.h' file not found

Ref :

KEMI - https://kamailio.org/docs/tutorials/devel/kamailio-kemi-framework RTPEngine module - https://kamailio.org/docs/modules/devel/modules/rtpengine.htm Dispatcher module - https://www.kamailio.org/docs/modules/5.1.x/modules/dispatcher.html#dispatcher.f.ds_select_domain

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