P.S. If you are doing load tests you may also be interested in
http://ftp.iptel.org/pub/sems/doc/current/Tuning.html

o Stefan Sayer on 03/30/2012 02:35 PM:
Hello,

simply set SIP and media IP to the ones that you want to use. e.g. if
it's on eth0 which has IP 192.168.5.110, and you want to use G711
codec only, you'd configure sems in sems.conf with

sip_ip=192.168.5.110
sip_port=5080
media_ip=192.168.5.110
rtp_low_port=10000
rtp_high_port=60000

application=echo
load_plugins=wav;echo;stats

you can see how many calls are active by running
sems-stats
for other codecs, load more codec modules (e.g. gsm,adpcm etc)

hth
Stefan

o Fomitchev, AndreiX on 03/29/2012 07:21 PM:
Hi All,

I need an “echo mode” for testing purpose of SIP, so I tried to use
sems as back-end of kamailio.

I built sems 1.4.2 from scratch using default Makefile and when I
launched it using default sems.conf, I was unable to establish a
communication because sems met “network” errors:

{log start}

(...)

[#b6476b70/4110] [run, udp_trsp.cpp:186] INFO: Started SIP server UDP
transport on 127.0.0.1:5080 [#b6a7cb70/4104] [send,
AmRtpPacket.cpp:212] ERROR: while sending RTP packet: Invalid argument
[#b6a7cb70/4104] [compile_and_send, AmRtpStream.cpp:313] ERROR: while
sending RTP packet: Invalid argument.

[#b7486b70/4094] [send, transport.cpp:114] ERROR: sendto: Invalid
argument [#b7486b70/4094] [send_request, trans_layer.cpp:899] ERROR:
Error from transport layer: Invalid argument

{log end}

I looked on internet (in maillist archive, for example, I read mail
exchange “ERROR: while sending RTP packet”) and I noted that it is
probably due to sip_ip and media_ip but I do not understand that it is
solution… Is there a documentation which explains sems configuration
in case of usage with Kamailio? What I need to configure in sems
or/and in Kamailio (expect echo mode, Kamailiio works fine)?

Thank you for your responses.

Best regards,

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