June 2005
Intermediate to advanced
502 pages
21h 48m
English
Content preview from Switching to VoIP
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Chapter 11: Troubleshooting Tools
Looking at captured packets will often tell you what signals a device is sending, but
not why it’s sending them. For that, you’ll need to go to the device’s logfiles and
diagnostic data. Comparing the caller’s account of the interop event with the
receiver’s account will help you reveal the root causes of interop problems.
Project 11.3. Trace Both Ends of a Call Setup
with Log Comparison
What you need for this project:
• Asterisk
• Xten Network’s X-Lite SIP softphone
• LAN
To set up an interop problem in the test lab, we’ll configure Asterisk to require an
MD5 secret for a SIP peer, without informing the SIP client, X-Lite, what the MD5
secret is. This will simulate lack of support for MD5 SIP authentication by the call-
ing endpoint, a common incompatibility. You can require an MD5 secret for any SIP
peer by finding the section for the peer in /etc/asterisk/sip.conf and adding:
md5secret=whatever
whatever signifies any string you want, since our purpose is merely to require MD5
support from the X-Lite SIP client. Once you’ve added this token to the sip.conf file,
issue a
reload at the Asterisk CLI and then launch X-Lite on a nearby PC. Attempt to
place a call using X-Lite configured for the extension number whose SIP peer you
just gave the
md5secret token. ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.