Hello,

Kamailio IP: 172.21.1.108, listening on port 5060

Asterisk IP’s: 172.21.1.97, and 172.21.1.124 both listening on port 5060

Here is a tcpdump which has the issue in it. I did a MicroSip call, which did work, and the Error I am speaking of did happen. Note: In this dump, I am running a cluster of 2 Asterisk Servers, however, this Error occurs even if I have only one Asterisk server with no dispatching, and rtpproxy turned off. However if rtpproxy is on, after each call, I do see an additional error =>

Nov 14 08:45:08 vadev2 /usr/local/sbin/kamailio[20525]: ERROR: rtpproxy [rtpproxy.c:2536]: force_rtp_proxy(): incorrect port 0 in reply from rtp proxy

In trying to further understand Kamailio –

Is there a way to limit the port trying to be opened to a maximum high number E.g. a port of < 20000? Even if this would work, I would still like to understand what Kamailio is trying to accomplish by the connection it is trying to make.
Are there any sources for a more in-depth understanding as to how Kamailio functions?

Also, if anyone has any input on my second question I would really appreciate it.

Thank you for looking at this,

-Steve

From: sr-users [mailto:sr-users-bounces@lists.kamailio.org] On Behalf Of Sergey Safarov
Sent: Tuesday, November 14, 2017 1:33 AM
To: Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org>
Subject: Re: [SR-Users] Kamailio questions

Need to capture network traffic and analyse by wireshark.
Command to capture traffic

tcpdump -ni any host 172.1.1.13 -s 0 -w /tmp/traffic.pcap

вт, 14 нояб. 2017 г., 3:14 Wilkins, Steve <swwilkins@mitre.org>:

Hello,

I am new to Kamailio and to the Kamailio Mailing list and hope I am using it appropriately.

I am using Kamailio version 5.0.3 (x86_64/linux), and it is installed and working on a Centos 7 Sever. I use Kamailio as a SIP Proxy Server for Asterisk and things seem to work fine, however, I do have an issue and a question for which I am trying to understand and am hoping someone can help me with.

For the sake of the argument, my server name is myServer, and it’s IP Address is 172.1.1.13; Asterisk is on a different server.

Issue: Every 10 seconds I get an Error message in the Kamailio log which says =>

Nov 13 18:10:55 myServer /usr/local/sbin/kamailio[29188]: ERROR: <core> [core/tcp_main.c:2660]: tcpconn_1st_send(): connect 172.1.1.13:59794 failed (RST) Connection refused.

I do not know what triggers this error, and as mentioned, things do seem to work; I can make calls and use sip tools which pass requests through the Kamailio to Asterisk. Does anyone know what could be causing this Error? I do not understand what is trying to connect to what at such a high port.

Question: The way I understand it, rtpproxy is needed to pass video/audio through Kamailio to Asterisk. However, even without rtpproxy running, I get video through to Asterisk and the video plays with no issues on a sip device (e.g. MicroSIP). I am confused what I need rtpproxy for.

Note: Even with no rtpproxy, I get the same error mentioned above in the Issue section.

Thank you,

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