Howto set a static IP for EVB

Set a Static IP for EVB

EVB requires a static IP number for proper operation. There are two popular methods for setting the IP.

1.) Reserve an IP number with you DHCP server for the MAC address of the EVB PBX machine.

2.) Use the system-config-network utility to set the network parameters. You would usually set the IP number outside of the DHCP server range. (NOTE: The old netconfig utility has been deprecated.)

Troubleshooting VOIP Calls

Troubleshooting VoIP Call Quality Issues

Assuming you have a Windows PC and a PBX running Linux, there are
two useful tools for troubleshooting call quality issues on VoIP -- Wireshark and Ping Plotter Freeware.
Sending the results from these programs to your provider will help them
diagnose the problem faster, but it doesn't guarantee the issue is
something they can fix!

Wireshark captures and analyzes network traffic. It has compatible
Linux and Windows versions, which makes it easy to capture the traffic
on your Linux PBX, copy it over to Windows and view the results. This
capture file can be used to identify almost any SIP problem, so being
able to do these steps is very helpful! To do the copy, you will also
need to install a program called pscp on your Windows PC.

Run the following to install Wireshark on your PBX (assuming it's running CentOS):

yum install wireshark

Run the following commands on your PBX to capture all traffic, SIP
(signalling) and RTP (audio), between the PBX and your provider's
server into file /root/my.cap. Based on the options used below, this
file can get very large very fast if you have lots of simultaneous
calls! Type Ctrl-C after making a phone call to stop the capture.

tshark host server.provider.com -w /root/my.cap

Run the following command to compress your capture file my.cap into a compressed my.cap.gz file:

gzip /root/my.cap

From your Windows PC, run the following to copy that capture file from
your PBX's IP address to your Windows PC's C: drive. You will be
prompted for the PBX's root password.

pscp root@192.168.1.2:/root/my.cap.gz C:\

Then you can open C:\my.cap.gz using the Windows version of Wireshark.
The Statistics > VoIP Calls menu will let you see all of the calls
and let you graph the SIP dialog (to diagnose problems registering or
incoming calls that don't ring) or playback the call (to find the one
with audio quality problems). The Statistics > RTP menu will let you
see all of the RTP streams (audio) and the packet loss, jitter, etc
associated with each one. If you see packet loss or high jitter during
the calls you experienced call quality issues with, that might explain
the problem!

Next, if you want to track down where the packet loss is occurring,
you can install Ping Plotter Freeware on your Windows PC and run a
continuous ping to a server on your provider's network. You might want
to ask them which server to use, because the SIP proxy or website may
not be ideal.

The Ping Plotter trace will help you identify if there was packet
loss during the times you experienced call quality issues. You can also
save the Ping Plotter capture and send that to your provider.

Remember, if the packet loss is at some router on the Internet
between you and your provider, you might both be helpless in fixing the
situation! Occasionally, your provider might be able to recommend a
different server to connect to that is on a network that will bypass
that troublesome router. You can also try using a different codec,
since some are better at packet loss concealment than others.

Resources:

http://www.pingplotter.com/tutorial/VoipTroubleshooting.html

http://www.voiptroubleshooter.com/

http://wiki.wireshark.org/VoIP_calls