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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