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Kamailio, Asterisk, VoIP, and IT Consulting

Tag: news

Residential VoIP

VoIP Tech Chat posted a new article discussing residential VoIP (and the savings you can get from switching). It’s an interesting read, especially the data with wireless only usage and some of the savings breakdown.

For a typical household, VoIP remains a very cost-effective telephone solution; although you must remember that without good (and we mean good), high-speed Internet, your VoIP will be unusable. Many local phone companies offer a “dial tone only” line for less than $15.00 monthly. With the use of VoIP and a dial-tone only landline, you can still save more than $150.00 yearly while providing your family a reliable method of calling during emergencies and power outages.

Asterisk Security Advisory AST-2009-002

Digium announced today a Remote Crash Vulnerability in the SIP Channel Driver affecting recent versions of Asterisk 1.4 and 1.6 branches. The full Advisory can be read directly from the Asterisk Project Security Advisory:

Description: When configured with pedantic=yes the SIP channel driver performs extra request URI checking on an INVITE received as a result of a SIP spiral. As part of this extra checking the headers from the outgoing SIP INVITE sent and the received SIP INVITE are compared. The code incorrectly assumes that the string for each header passed in will be non-NULL in all cases. This is incorrect because if no headers are present the value passed in will be NULL.

The values passed into the code are now checked to be non-NULL before being compared.

Resolution: Upgrade to revision 174082 of the 1.4 branch, 174085 of the 1.6.0 branch, 174086 of the 1.6.1 branch, or one of the releases noted below.

The pedantic option in the SIP channel driver can also be turned off to prevent this issue from occurring.

Affected Versions

1.4.x (Versions 1.4.22, 1.4.23,
1.6.0.x (All versions prior to
1.6.1.x (All versions prior to
C.x.x (Only version C.2.3)

If you need assistance in updating or reviewing your Asterisk installation, please contact Team Forrest today.

The Asterisk S-Prize

John Todd, with Digium, announced a very cool contest — The Asterisk S-Prize.

To encourage the improvement and testing of larger-scale Asterisk systems, I’d like to repeat here what I mentioned today on the asterisk-dev mailing list: I’m putting out a semi-official challenge in place. The first person to get an Asterisk system moving 10,000 G.711 call legs through a single instance on a single machine will get a first-class steak dinner at Astricon. And a great bottle of wine, if that is your preference.

To read more about the contest, check out the official post at Digium.

Parking Availability, Team Forrest, and Asterisk

Ann Arbor Parking

Recently, Fred Posner of Team Forrest, assisted Edward Vielmetti with a simple idea — help make information accessible. In this case, the information was the availability of Parking Spots in Ann Arbor, Michigan.

The Ann Arbor Downtown Development Authority (A2DDA) publishes data regarding parking spot availability on the web, however, when you’re driving to the garage navigating to a web site is the least of your worries. So, an idea was born to make parking information readily accessible — and with that, Team Forrest’s Fred Posner built a quick prototype to demonstrate how Asterisk (by Digium) can help rethink how data can be accessed.

In the prototype, a caller can select which garage to query. The system will then speak to the caller the remaining number of spaces and offer 3 options — select another garage, exit (and hear the local weather), or choose to be notified if there are fewer than 10 spaces remaining. If the caller selects the notification option, the system will automatically check once a minute (for 30 minutes) and initiate a call out to the user. The call will remind the user which garage they selected and inform them of the current number of available spaces.

The prototype for this project can be accessed from the Team Forrest main line, at +1 (212) 937-7844. Then, choose 6 for check local Ann Arbor Parking availability.

About Team Forrest

Team Forrest offers complete Internet Consulting services, specializing in VoIP and Asterisk solutions. Team Forrest has one simple goal: Help the client. Whether you need emergency assistance or if you are planning a deployment, Team Forrest is here to help. With over 15 years experience, our team can quickly assess your needs and help deploy the most appropriate solution.

About Asterisk

Asterisk (by Digium) is the world’s leading open source telephony engine and tool kit. Asterisk empowers communication with it’s flexibility. Asterisk is released as open source under the GNU General Public License (GPL), and it is available for download free of charge. Asterisk is the most popular open source software available, with the Asterisk Community being the top influencer in VoIP.

Related Information:

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TEAM FORREST constantly works to provide the best service possible. And with 2009, we look forward to launching some new products, new services, as well as continuing to work with our clients to exceed expectations.

To help communicate new services to our clients, potential clients, friends, and team, we provide several methods of contact, such as:

  • RSS Feed for news / notices
  • Twitter account for updates
  • The Team Forrest Website
  • e-mail newsletters
  • not to mention… the telephone

So, if you’re not on Twitter, please consider getting an account and following us. It’s a great method to keep up to date on the latest events and happenings.

Have you downloaded Asterisk? (Your competitor probably has)


Asterisk is a registered trademark of Digium

Asterisk is a registered trademark of Digium

Asterisk® (a registered trademark of Digium, Inc.) simply makes sense. Take one part open source software, one part VoIP, one part PBX, and combine. What do you have? A software so popular, more than 1.5 million downloads occurred in 2008 alone.

Team Forrest can help you implement an Asterisk solution to fit your exact needs. Popular implementations include:

  • Integrating VoIP to save money on Telephone Services
  • Using Asterisk to power Call Centers (both inbound and outbound)
  • Easily integrating telecommuting / presence
  • Creating a powerful, yet affordable, business class phone system

For more information on how Team Forrest can help you, contact us today for a free consultation.

Additional readings:

Univeristy of Florida Security Breach

A compromised University of Florida server allowed access to more than 300,000 patient records. The records contained information such as birth dates, names, addresses, and social security numbers. Not a great example for corporate America. Let’s learn from their mistake.

Residential VoIP expecting Large Growth

VoIP Tech Chat posted an interesting article regarding the expected increase of VoIP in the residential market. The article discusses the switch of residential users from such providers as Verizon and at&t to cable companies, VoIP providers, and cellular services.

While many Residential users may want to use a simple service such as those provided by cable companies, we also believe some households can greatly benefit from their own networked VoIP system — such as Asterisk or Trixbox.

With telecomuting becoming a more accepted method of work, a local Asterisk solution can separate work calls from home, provide a powerful business presence, as well as saving money on regular household calls.

Plus, the use of a dedicated computer for your phone system can also provide your home with a centralized server for storage, media, and data back-up. Talk about a win / win.

For more information on how Team Forrest can help, please call +1 (212) 937-7844 today.

Asterisk chosen over Cisco Call Manager

Sam Houston State University (over in Texas) has just switched from Cisco Call Manager over to Asterisk. We love it. Team Forrest proudly uses Asterisk and this action only shows what we’ve been saying for a while. Asterisk is an amazing, cost effective product.

A great write up is over at Asterisk VoIP News (it’s a nice quick read).

FTC Regulates Prerecorded Calls

The FTC has announced new regulations (effective September 2009) governing telemarketers usage of prerecorded messages in unsolicited sales calls.

Learn more: