How to Configure NVFax on FreePBX

Earlier I received a call from a client wanting to know if their VoIP solution would allow them to receive fax calls that would convert a fax to email. After looking at their system the solution was fairly easy since they are running Asterisk with a FreePBX front-end. There are two options with FreePBX when setting up incoming fax lines which include NVFax or Zaptel. Having used both solutions in the past the NVFax option has always worked without issue and that is typically my default selection unless there are extra requirements. Follow the directions below to configure a Asterisk FreePBX DID for fax to email conversion.

Technology Insights

Asterisk Check T1 Status Because Faxes Sent Via Hylafax Fail

If you have a Asterisk system being used for sending and receiving faxes and all of the sudden the faxes all start failing with various error messages the first thing that should be checked is the status of either the analog telephone lines, the T1’s, or the SIP provider you are using as a outbound proxy. Below I describe some of the error messages that may be received via Hylafax in this example as well as how to check the status of the T1’s themselves to make sure that there are no alarms present before you have to get into troubleshooting Hylafax in detail.

Technology Insights

Modify MFC-5890CN Scan Import To Open Adobe Photoshop Instead Of Microsoft Paint

Earlier today I needed to scan in a receipt at the computer shop so I needed to configure the Brother MFC-5980CN all in one printer on my laptop. One of the things that always gets on my nerves about scanning in documents on most scanners is that by default it opens Microsoft Paint which is the worst application for image editing. Below are directions on how to modify the default application for scanning in images on the MFC-5980CN printer from MS Paint to Photoshop.

Technology Insights

How to Batch Resize Image from Linux Shell with ImageMagick

ImageMagick is a really cool product. Not only is it open source but its very powerful tool. My goal was to figure out how to batch resize images while keeping one side 640 pixels wide. I ended up using ImageMagick’s mogrify by issuing the command below at my CentOS shell prompt.

mogrify -resize x640 *.jpg

or

mogrify -resize 640 *.jpg

Depending on which side you want to be 640 pixels. If you would like for image magic to make the largest side 640 and constrain the proportions use the following command.