Sometimes when you move a hard disk, containing ubuntu with ip set statically, to another PC you may not be able to see your ethernet card in ifconfig.
Why? Because linux is smart, it auto detects new ethernet and give your current ethernet next available label, like : eth1.
Firmware upgrade using TFTP
It happens a lot that in order to upgrade the firmware of certain devices you would need TFTP server.
Using the instruction on this post you can easily upgrade your firmware.
LCR- Change outgoing route and Call number
Trunk to a SIP switch using FreePBX
Below is the instruction:
Java Script Sample
Here are 2 Java Script functions on how to filter numeric / alphabetic characters typed in an edit box: