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

Link Two RTP Engines by Daisy Chain Linking

Ensure you have added two RTP engines in rtpengine list file

id(int,auto) setid(int) url(string) weight(int) disabled(int) stamp(int)
1:1:udp\:<rtpengine_ip1>\:2222:1:0:0
2:2:udp\:<rtpengine_ip2>\:2222:1:0:0

Ensure you have both the RTP engines loaded

kamcmd -s tcp:<appserver_ip>:2046 rtpengine.show all

The output of this should be

{
	url: udp:<rtpengine_ip1>:2222
	set: 1
	index: 0
	weight: 1
	disabled: 0
	recheck_ticks: 0
}
{
	url: udp:<rtpengine_ip2>:2222
	set: 1
	index: 0
	weight: 1
	disabled: 0
	recheck_ticks: 0
}

Test the system

 sipp -sf sipp_uac_rtpecho.xml  -s 300 <app_Server_ip>:5066  -i <sipclient_ip> -trace_err -m 1

Run

Kamailio

 kamailio -f kamailio_lua.cfg -Ee

RTPengine via config

Debugging

Issue1 ERROR: connect_unix_sock: connect(/var/run/kamailio//kamailio_ctl): No such file or directory [2] Solution ensure the ctl modules is used and connectred to correct ip of app server

 loadmodule "ctl.so"
...
# ----- ctl ------
 modparam("ctl", "binrpc", "tcp:<ip>:2046")

and use server address while using kamcmd

kamcmd -s tcp:<appserver_ip>:2046 app_lua.reload 0

You can use either

  1. set_rtp_engine_set(r1,r2)

or

  1. rtpengine_set(r) twice

Issue2 Dispatcher not Found solution Look up if dispatchers is successfull added , also checked is dispatcher destination is responsing to OPTIONS keepalive pings

kamcmd -s tcp:<appserver_ip>:2046 dispatcher.list   
{
	NRSETS: 1
	RECORDS: {
		SET: {
			ID: 1
			TARGETS: {
				DEST: {
					URI: sip:<destination_ip>:5080
					FLAGS: IP
					PRIORITY: 0
					ATTRS: {
						BODY: 0
						DUID: 
						MAXLOAD: 0
						WEIGHT: 0
						RWEIGHT: 0
						SOCKET: 
					}
				}
			}
		}
	}
}

You cna also reload the dispatcher

kamcmd -s tcp:<appserver_ip>:2046 dispatcher.reload

Issue 3 CTL module not connecting

 0(23404) ERROR: ctl [init_socks.c:210]: init_tcpudp_sock(): ERROR: init_tcpudp_sock: bind: Cannot assign requested address [99]
 0(23404) ERROR: ctl [ctl.c:291]: mod_init(): ERROR: ctl: mod_init: init ctrl. sockets failed
 0(23404) ERROR: <core> [core/sr_module.c:911]: init_mod(): Error while initializing module ctl (/usr/local/lib64/kamailio/modules/ctl.so)


solution check whether the IP address is prohibited with correct IP and port

 modparam("ctl", "binrpc", "tcp:192.168.1.111:2046")

or define using substitute string like

#!substdef "!MY_IP_ADDR!192.168.1.111!g"
#!substdef "!MY_CTL_ADDR!tcp:MY_IP_ADDR:2046!g"
...
modparam("ctl", "binrpc", MY_CTL_ADDR)

Issue 4 src/utils/kamutils.lua:5: module ‘cjson’ not found:
solution Install cjson using luarocks

luarocks install lua-cjson

If you further get

Installing https://luarocks.org/lua-cjson-2.1.0.6-1.src.rock
gcc -O2 -fPIC -I/usr/include/lua5.2 -c lua_cjson.c -o lua_cjson.o
lua_cjson.c:43:10: fatal error: lua.h: No such file or directory
 #include <lua.h>
          ^~~~~~~
compilation terminated.

Error: Build error: Failed compiling object lua_cjson.o

then ensure you have both lua and lua dev libs

sudo apt-get install liblua5.2 liblua5.2-dev

Note : Often there may be version mismatch between lua5.1 and lua 5.3 in which case the path for seraching cjson.o will mismatch such as installversion 5.2 but program look in path for 5.1

module 'cjson' not found:
	no field package.preload['cjson']
	no file './cjson.lua'
	no file '/usr/local/share/lua/5.1/cjson.lua'
	no file '/usr/local/share/lua/5.1/cjson/init.lua'
	no file '/usr/local/lib/lua/5.1/cjson.lua'
	no file '/usr/local/lib/lua/5.1/cjson/init.lua'
	no file '/usr/share/lua/5.1/cjson.lua'
	no file '/usr/share/lua/5.1/cjson/init.lua'
	no file '/etc/kamailio/cjson.lua'
	no file '/etc/kamailio/utils/cjson.lua'
	no file '/etc/kamailio/cjson.lua'
	no file '/etc/kamailio/utils/cjson.lua'
	no file '/etc/kamailio/core/cjson.lua'
	no file './cjson.so'
	no file '/usr/local/lib/lua/5.1/cjson.so'
	no file '/usr/lib/x86_64-linux-gnu/lua/5.1/cjson.so'
	no file '/usr/lib/lua/5.1/cjson.so'
	no file '/usr/local/lib/lua/5.1/loadall.so'

in such as case it is best to either use some version control manager like luaver or ditch the current lua and reinstall

Do not try to repeat my mistake of creating softlink or copy source between version 5.2 and 5.1

  cp -r /usr/local/share/lua/5.2/ /usr/local/share/lua/5.1/

which will create even more issues later

12(5499) ERROR: app_lua [app_lua_api.c:326]: lua_sr_init_child(): error from Lua: error loading module 'cjson' from file '/usr/local/lib/lua/5.1/cjson.so':
	/usr/local/lib/lua/5.1/cjson.so: undefined symbol: luaL_setfuncs

Also you can use the modules directly instead of installing via luarocks

sudo apt get install lua-cjson

Issue 5 base58.lua lua module

 4(5541) ERROR: app_lua [app_lua_api.c:326]: lua_sr_init_child(): error from Lua: ...main.lua module 'base58' not found:
	no field package.preload['base58']
	no file './base58.lua'
	no file '/usr/local/share/lua/5.1/base58.lua'
	no file '/usr/local/share/lua/5.1/base58/init.lua'
	no file '/usr/local/lib/lua/5.1/base58.lua'
	no file '/usr/local/lib/lua/5.1/base58/init.lua'
	no file '/usr/share/lua/5.1/base58.lua'
	no file '/usr/share/lua/5.1/base58/init.lua'


solution base58 is decoder and encoder for strings. Just as explained in issue no 4 some dependencies are lua version specific such as this one

> luarocks install base58
Error: base58 supports only Lua 5.1 but not Lua 5.2.

Issue 6 proxy replied with error: Ran out of ports

 1(19894) ERROR: rtpengine [rtpengine.c:2588]: rtpp_function_call(): proxy replied with error: Ran out of ports

Solution check port permission. In my case restrating rtpenine and runinig kacmd rtpengine.eload solved the issues

Issue 7 Failed to extract streams from SDP: Invalid RTP payload types

Failed to extract streams from SDP: Invalid RTP payload types
Protocol error in packet from 106.215.152.21:7165: Incomplete SDP specification [d8:supportsl10:load limite3:sdp774:
v=0#015#012o=FreeSWITCH 1590090363 1590090364 IN IP4 172.20.10.2#015#012
s=FreeSWITCH#015#012
c=IN IP4 172.20.10.2#015#012
t=0 0#015#012
a=msid-semantic: WMS Zmjg65pfviISGEmPFeOwUXi8jk0cvpOk#015#012
m=audio 30676 RTP/AVPF 8 101#015#012
a=rtpmap:8 PCMA/8000#015#012
a=rtpmap:101 telephone-event/8000#015#012
a=ptime:20#015#012
a=rtcp:30677 IN IP4 172.20.10.2#015#012
a=ice-ufrag:fFz0sHYBSPDe4iow#015#012
a=ice-pwd:6FUQbpWQrL2ZMS2RorIGZx8H#015#012a=candidate:2330066942 1 udp ...
659136 172.20.10.2 30676 typ host generation 0#015#012
a=candidate:2330066942 2 udp 659135 172.20.10.2 30677 typ host generation 0#015#012
a=end-of-candidates#015#012
a=ssrc:1122649911 cname:BYryTGEfOcYlHb0c#015#012a=ssrc:1122649911 msid:Zmjg65pfviISGEmPFeOwUXi8jk0cvpOk a0#015#012
a=ssrc:1122649911 mslabel:Zmjg65pfviISGEmPFeOwUXi8jk0cvpOk#015#012a=ssrc:1122649911 label:Zmjg65pfviISGEmPFeOwUXi8jk0cvpOka0#015#012
m=audio 0 RTP/AVPF 193:ICE6:remove5:label10:Cleg_label5:flagsl19:full-rtcp-attributee7:replacel6:origin18:session-connectione18:transport-protocol8:RTP/AVPF7:call-id49:103103N2JhNjlhZTk3YjkxM2Y3ZWY0NzFhMzU3Y2ZmN2NlNWY13:received-froml3:IP411:172.20.10.2e8:from-tag8:45e1e95f6:to-tag13:Ht9rSU4mBFN5H7:command6:answere]

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