I am not going to clog the web. This article from Microsoft solves it perfectly.
http://support.microsoft.com/kb/933996
Difference Between FXO and FXS
FXS (Foreign Exchange Subscriber) is the Wall Jack
FXO (Foreign Exchange Office) is the Phone Jack
Reference :
http://www.3cx.com/PBX/FXS-FXO.html
Keeping Your Linux System Updated (RedHat Based Distributions )
Just using the out of the box RedHat packages you will realize soon that there are a lot of applications that you are missing. The solution is to install other repositories that yum can use to get the software that you are trying to install. One such repository is the “RPMForge” (http://wiki.centos.org/AdditionalResources/Repositories/RPMForge), this repository has many more software so you will not have to keep chasing software and compile them if you do not have the time .
I also like to use the atomicop repos http://3es.atomicrocketturtle.com/packages/atomic-release/ just run the “RPM” and it will take care of installing the repos.
References:
Additional Repositories
http://wiki.centos.org/AdditionalResources/Repositories/RPMForge
DAG
http://dag.wieers.com/rpm/FAQ.php#B
RPMforge
http://rpmrepo.org/RPMforge
Useful VI Websites
As much as i like VI, I must be honest; I am not going to remember all these funky commands. I have gathered these links below to help people out whenever they forget let’s the command to display the line numbers for example:
http://www.colorado.edu/ITS/docs/unix/vi.html
http://www.cs.rit.edu/~cslab/vi.html
http://www.cs.fsu.edu/general/vimanual.html
http://osr600doc.sco.com/en/FD_create/vi_summary.html
http://www.tuxfiles.org/linuxhelp/vimcheat.html
Unexpected Error 0x8ffe2740 Occurred
The error is caused by a port confict according to Microsoft (http://support.microsoft.com/kb/816944).
Use IIS manager change the port to something else let ‘s say 7000 and see if you get the error.

