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  1. Troubleshooting Kamailio DNS settings

    Problem VoipNow 3, which by default has DNS caching enabled, comes with a different version of Kamailio. The problem is that, in some situations, customers … 3 /etc/kamailio/kamailio.cfg contains a setting called: usednscache, which by default is set to "yes". This means that all DNS request results will be cached
    4PSA Knowledge BaseAug 09, 2017
  2. Fail2Ban for Kamailio on VoipNow 4.0.0

    http://kamailio.org/docs/modules/1.5.x/pike.html module is used to log and throttle incoming request IP addresses. The messages logged by Kamailio look like this: 1449744585: L1 … the Kamailio configuration file for Fail2Ban. This file needs must be placed in /etc/fail2ban/filter.d/kamailio.conf and must contain the following: Definition failregex
    4PSA Knowledge BaseAug 09, 2017
  3. How to debug Asterisk and Kamailio

    ) STEP 6: When're done, you can disable SIP debugging using: asterisk rx "sip set debug off" The Kamailio logs These logs are useful in case incomingcall related problems occur. When you set up a channel for the first time, it always helps to look at a Kamailio log file. Especially if you do not know the exact format
    4PSA Knowledge BaseAug 09, 2017
  4. How to configure TLS support for Snom

    (if you have a distributed system) do the following: STEP 1: Open /etc/kamailio/kamailio.cfg STEP 2: Check the value of the verifycertificate parameter for the TLS module: Check an user certificate to be correctly signed by a trusted CA modparam("tls", "verifycertificate", 0) If it's set to 0, it means Kamailio
    4PSA Knowledge BaseAug 09, 2017
  5. How to monitor VoipNow with Homer

    (i.e. Homer Encapsulation Protocol). Asterisk and Kamailio natively support HEP through the "reshep" (Asterisk) and "siptrace" (Kamailio) modules. For the time being, VoipNow's versions of Asterisk or Kamailio are not using these modules. So, for the Capture Agent, you can use port mirroring, Homer's CaptAgent, sngrep
    4PSA Knowledge BaseAug 09, 2017
  6. How to detect abnormal traffic using Pike

    Applies to VoipNow 4.0.0! VoipNow 4.0.0 comes packed with Pike. Pike is not a programming language. It's a module implemented in Kamailio that keeps track … limits are exceeded. It's better not to rely only on Kamailio to block such IP addresses. Pike also reports abnormal traffic coming from different sources
    4PSA Knowledge BaseAug 09, 2017
  7. Understanding codec negotiation

    negotiation occurs. The SIP signalling also passes through Kamailio. In the case of a call from the internal (private) network to the outside (public) network, the flow of the SIP signalling is as follows: Internal caller >> Kamailio >> Asterisk >> Kamailio >> External callee. Here is a Wireshark capture of the flow (click
    4PSA Knowledge BaseAug 09, 2017
  8. Troubleshooting calls and debug steps

    Applies to VoipNow 3 and higher! When dealing with call failure, you need to determine the VoipNow infrastructure layer where the call seems to fail: KamailioKamailio Make sure your SIP traffic reaches Asterisk. To do this, log in your VoipNow server as root using your favorite SSH console (e.g. Putty), set sip set debug
    4PSA Knowledge BaseAug 09, 2017
  9. How to use VoipNow 3 behind a firewall

    interface. 5060 The SIP port used by Kamailio to accept connections from phones. 5050 The Asterisk port. 5061 The TLS SIP port used for encrypted connections … to be open for the RTP (audio) traffic. 5060 The TCPUDP Kamailio SIP port. 5061 SIP TLS port used by Kamailio (optionally). 5050 The UDP Asterisk SIP port. 53 DNS
    4PSA Knowledge BaseAug 09, 2017
  10. Troubleshooting incoming calls when the server is behind NAT

    to the called server. STEP 3: Analyze the SIP server log. tail f /var/log/kamailio/kamailio.log Jun 21 07:56:24 localhost /usr/sbin/kamailio4122: DEBUG: Incoming
    4PSA Knowledge BaseAug 09, 2017