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An Asterisk server has a very involved configuration system. One instance I manage has over 100 configuration files. As these configurations grow, it can be helpful to have a separate server running for testing and debugging problems. If you are planning a major change, it's often helpful to get it …
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This is a sad story. A few weeks ago, I set my OnePlus One down on a table outside so that it would not be in my pocket while I worked on the pool. I have done enough work on the pool to know that at any moment, I might …
Posted on in voice
It seems the maximum length for variables (at least those in extensions.conf) in Asterisk 1.2 is 255 characters. Running into this problem has to be uncommon, but it can really bite you if aren't aware.
Although I am only aware of this limitation in Asterisk 1.2, it …
Posted on in voice
If your carrier doesn't allow 10 digit dialing for local numbers, you are probably pretty annoyed that you can't just hit the redial button on those missed calls. It's possible to rewrite these dialed numbers in your phone system, but I wanted to do this on my Cisco 7961 IP …
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In Asterisk 1.4 and above, you can dynamically add and remove queue members from
an extension or the command-line interface (CLI). Although you will most likely
do most of your adding and removing via extensions, you might also find it helpful
to remove a queue member by hand on …
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I hate losing useful SQL queries, so I tend to save them. Ever so often, I stumble across a file of queries from some work I was doing months ago. The following two queries are just such a case. I was analyzing some call data for a call center that …
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Although Cisco now markets these phones and ATAs via their Small Business line, I still think of these devices as being Linksys. Although the software that Cisco provides for these devices comes with an upgrade executable, it is only for Windows operating systems. I have found that the easiest way …
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It's not often that I have to restart a Asterisk VoIP PBX. I recently upgraded to the latest version of Asterisk 1.4. After the installation was complete, I restarted the service and everything appeared to be functioning OK. Processes were running and owned by the asterisk user. When I …
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Protocol Basics
Layer: Application
Transport: <acronym title="Transmission Control Protocol">TCP</acronym> or <acronym title="User Datagram Protocol">UDP</acronym>
Port(s): 5060, 5061
RFC(s): 2543, 3261
SIP is by far the most popular protocol used in VoIP communication today. SIP was designed as a …
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For about a month, I've had a problem with my Contacts app crashing on my T-Mobile G1. Whenever this would happen, I would be forced to close the Contacts application. This was a pretty major pain in the butt since I tend to use the Contacts and Favorites tab to …
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This information is contained in the documentation for the ATA, but I never have that handy when I need it. Here are the steps for performing a factory reset on a Sipura 2100 ATA:
Posted on in voice
If your PBX is Asterisk based, you need to subscribe to the asterisk-announce mailing list. This is where Asterisk developers post information regarding new releases and security updates for all versions of Asterisk. If you were on this mailing list, you would know that two recent security alerts (see below …
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I ran across an instance of Asterisk the other day that was working fine except that none of the MeetMe conference bridges were valid. The conference bridges were previously working, but the server had recently lost power and rebooted. Whenever someone tried to use a conference bridge, the following message …
Posted on in voice
In my office here at the Slaptijack world headquarters, I have a cordless phone attached to a Linksys (née Sipura) SPA-2100. Thanks to the Visual Message Waiting Indicator (VMWI), I have a nice blinking LED whenever I have a voicemail waiting on my Asterisk server. Unfortunately, the Linksys SPA-2100 is …
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If you use a new Linksys VoIP phone (for example, the Linksys SPA942), you probably don't have to worry about the change to Daylight Savings Time that began in 2007. By default, your phone has the right information about when Daylight Savings Time begins and ends.
On the other hand …
