AMD And Fax Detection

Home » Asterisk Users » AMD And Fax Detection
Asterisk Users 2 Comments

Is it feasible to enhance AMD to detect and report if the far end sends fax tones?

I am guessing that, as it is using DSP to detect sounds and periods of silence, the same DSP can also report if a CED tone is sent.

If it is feasible, is there a document describing the DSP interface that someone who is not familiar with DSP can use to get started?

Neil Youngman

Neil Youngman Developer Wirefast Limited

Wirefast provides secure corporate messaging services. See our messaging solutions at http://www.wirefast.com/
Please consider the environment. Does this email or attachment need to be printed?
This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this email. Please notify the sender immediately by email if you have received this email by mistake and delete this email from your system.

Any views or opinions are solely those of the author and do not necessarily represent those of Wirefast Limited

Email transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. The sender therefore does not accept liability for any errors or omissions in the contents of this message which arise as a result of email transmission. Wirefast Limited is registered in England & Wales Company number: 03865860
Registered Office: 7/10 Chandos Street, Cavendish Square, London, W1G 9DQ

Wirefast definitions of classification can be found here: www.wirefast.com/classifications

2 thoughts on - AMD And Fax Detection

  • I think that there is a much easier way to detect if the far end is a fax. In your dialplan, include a section that uses the ‘fax’ extension. If the call jumps to that extension, then the far end is a fax machine. Regards;
    John V.

    —–Original Message—

  • A quick test to a fax number doesn’t seem to jump to the ‘fax’ extension. I checked faxdetect=both on chan_dahdi.conf. I seem to remember trying this some years back and finding that fax detect only worked for CNG tones, not CED tones?

    Neil Youngman