h1. FAS-Detector

[[FAS Detect]] application does the job of FAS detection (see [[Fighting against FAS]]) for you automatically. It analyzes the voice stream and in case it founds service tones (ringing, progress, etc) at the very beginning of a voice channel establishment, it marks this call as FAS. Later you can select those calls from the [[Call Detail Report]].

Here's how FAS call looks like:

!fas.png!

FAS detection is convenient to be used in conjunction with recording a call media with [[Start Mix Monitor]] application. This makes possible to listen to the FAS and to investigate the issue with the service provider.

*Operating [[FAS-Detector]]*
 
To start [[FAS-Detector]] operation You should firstly need to configure [[Call Handler]]. In case of using it with the originator, add [[FAS-Detector]] application to the [[Call Handler]] of the originator BEFORE adding the [[Softswitch]] application. For example:

!fas_detector_example.png!

In case of terminator, add [[FAS-Detector]] application to the [[Call Handler]] of the terminator BEFORE adding the [[Dial]] application. For example:

!Fas_detector_example2.png!

*Note!* [[FAS-Detector]] application is *does not work* if:
* "fast RTP proxy" mode enabled
* "direct RTP connection" mode enabled

[[FAS-Detector]] application will also work improperly in case there is an [[Answer Channel|Answer]] application somewhere after.

[[Детектор FAS|Русский перевод]]