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Hello Ahmed,<br>
<br>
I don't think there is a reliable way to detect FAS on a per call
basis. Even audio detection software can be confused by strange
ringtones, answering machines, etc.<br>
<br>
The most reliable way we have found is to use statistics from CDRs and
see if the INVITE-to-200(OK) delay averaged over a number of calls
appears to be too small. If it is, then it is possible that you got FAS
for those calls. <br>
<br>
But this can only tell you if you have been experiencing FAS in past
calls, ie you will not know you are getting FAS in real time. <br>
<br>
It is still useful however: after you detect a possible FAS case via
statistics you can place a few test calls yourself to verify that there
actually exists FAS (and this is the only information that a carrier
will accept in a trouble ticket to prove to them that they actually
give you FAS).<br>
<br>
I hope this helps. <br>
<pre class="moz-signature" cols="72">Best regards,
Vlasis Hatzistavrou.</pre>
<br>
On 8/1/10 3:05 πμ, Ahmed Naji wrote:
<blockquote
cite="mid:cd93b3701001071705w5bae2e88pe22308a799907a98@mail.gmail.com"
type="cite">Hi everyone,<br>
<br>
Was just wondering what/if anyone is doing any work on FAS detection
and spoofed ring tones. Be great to discuss some ideas.<br>
<br>
Regards,<br>
<br>
Ahmed.<br clear="all">
<br>
-- <br>
Ahmed Naji<br>
<pre wrap="">
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