<div>Using Libss7/Dahdi and Asterisk 1.6.x, I want to be able to detect outbound calls if it has been redirected and if so, how many times. There are standard fields in ISUP ITU Q.763 specs (<a href="https://staff.ti.bfh.ch/mdm1/Kursunterlagen/SS7/T-REC-Q.763.pdf">https://staff.ti.bfh.ch/mdm1/Kursunterlagen/SS7/T-REC-Q.763.pdf</a>) that stated the information should be available. This is for fraud prevention as we have some very restricted numbers that cannot be forwarded. For now, we just need to be able to know if the call has been forwarded whether via Asterisk log or writing some variable information back to the CDR for easier looking up. We don't need to cancel the call or take any action if a call has been redirected.</div>
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<div>We would like to perform some tests with the Redirection Counter increased artificially (in Asterisk) to 4 or 5. We then look at the Release Cause, which should give us some useful information. What we’re looking for is to change bits KJI of section 3.45 in the attached ITU-T Q.763 document.</div>
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<div>In our capture, we do see the following which shows the redirected number down the line in the ACM message:</div>
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<div>ACM: cwvoip1*CLI> --OPTIONAL PARMS--</div>
<div>cwvoip1*CLI> Generic Notification Indication:</div>
<div>cwvoip1*CLI> [ 2c 01 fb ] </div>
<div> Unknown Parameter (0xc):</div>
<div>cwvoip1*CLI> [ 03 10 87 30 41 28 69 ] </div>
<div> Unknown Parameter (0x36):</div>
<div>cwvoip1*CLI> [ 19 ]</div>
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<div>Can anyone clarify the “2c 01 fb” parameter please? I think we worked out that ‘fb’ means “call is diverting”, which would be useful. Unknown Parameter 0xc appears to be the redirecting number.</div>
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<div>We are also planning for an upgrade to Asterisk 1.8 to have access to the redirection counters.(<a href="https://wiki.asterisk.org/wiki/display/AST/Manipulating+Party+ID+Information#ManipulatingPartyIDInformation-REDIRECTINGdialplanfunction">https://wiki.asterisk.org/wiki/display/AST/Manipulating+Party+ID+Information#ManipulatingPartyIDInformation-REDIRECTINGdialplanfunction</a>). </div>
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<p>Executing ... Set("SIP/447684527310-00000000", "REDIRECTING(count,i)=5") in new stack<br>[Jul 6 17:02:29] ERROR[29662] pbx.c: Function REDIRECTING not registered</p>
<p>We're hoping to set this counter in Asterisk 1.8 and patch DAHDI to perform pcap dump hoping maybe wireshark can help produce better analysis of the field names instead of "Unknown" but for now, does anyone know what the above means?</p>
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