Articles tagged with asterisk

  1. Pro Tip: Keep Asterisk Configuration Files in Version Control

    Posted on in voice

    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 …

  2. Asterisk 1.2 Variable Length Limit

    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 …

  3. Adding Removing Dynamic Queue Members (Asterisk 1.4+)

    Posted on in voice

    Asterisk Logo 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 …

  4. Two Random Asterisk-Related SQL Queries

    Posted on in voice

    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 …

  5. Unable to Connect to Remote Asterisk

    Posted on in voice

    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 …

  6. Voice over IP (VoIP) Protocol Review

    Posted on in voice

    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 (Session Initiation Protocol)

    SIP is by far the most popular protocol used in VoIP communication today. SIP was designed as a …

  7. Subscribe to asterisk-announce

    Posted on in voice

    Asterisk logoIf 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 …

  8. MeetMe Not Working? Verify the Zaptel Kernel Module

    Posted on in voice

    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 …

  9. Stop That Linksys VMWI Half Ring

    Posted on in voice

    Linksys / Cisco SPA-2100 Ring Splash HighlightedIn 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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