As it stands now we're at about 99.714% accuracy. Very little with fax transmission is guaranteed 100% but it would be nice to get even closer. Due to the nature of the detection mechanism if there isn't a valid CNG then the call will be assumed voice. There is nothing we can do about that. Perhaps what I am looking for is challenging but considering my expectations far from unattainable. It should not be impossible to detect the 1100hz CNG tone, it should not be any different than detecting the combination of DTMF tones (which I believe are combinations of 697hz,770hz,852hz,941hz plus any of 1209hz,1336hz,1477hz, and 1633hz depending on the keypress). It should be easier considering there is a standard length for the CNG tone whereas with DTMF on many phones it depends on how long they feel like holding the button down.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Damjan Jovanovic Sent: February-14-08 11:19 PM To: Users Mailing List - Non-Commercial Discussion Subject: Re: [Callweaver-users] Fax detection while playing a soundfile? X-ECN Telecoms-MailScanner-Information: Contact ECN Telecoms X-ECN Telecoms-MailScanner: Found to be clean X-ECN Telecoms-MailScanner-SpamCheck: not spam, SpamAssassin (not cached, score=-101.8, required 6, autolearn=not spam, ALL_TRUSTED -1.80, USER_IN_WHITELIST -100.00) X-ECN Telecoms-MailScanner-From: [EMAIL PROTECTED] X-Spam-Status: No On Thu, 2008-02-14 at 11:55 -0600, Brandon Mackie wrote: > Good afternoon, > > > > Our goal is to have the ability for a voice line to recognize faxes. Your goal is unattainable. A fax machine only generates the CNG tone in theory: in practice many use the wrong frequency, wrong cadence, or don't generate the CNG at all. If you need to detect faxes with 100% accuracy, either you need a dedicated fax line, or a "Press 1 to send a fax" IVR where you then unconditionally call RxFAX() if they press 1. > At this point we are using FaxDetect and playing a ringing sound at > the beginning of the callpath. People with fax-and-walk-away type fax > machines are just fine. The fax tone is played during the ringing time > and it gets accepted perfectly. We run into issues with fax-phones or > generally elderly people. The ideal would be the ability to play while > the menu is being played. Something along the lines of “Thank-you for > calling ABC company, if you would like to send a fax you may do so at > any time, press 1 for our dial by name directory, 2 for sales,etcetc”. > I tried to figure out the BackgroundDetect application but it didn’t > appear to do what I was trying to accomplish. Is there something that > would do this or should I add that to the feature request list? > > > > -Brandon Damjan > _______________________________________________ > Callweaver-users mailing list > [email protected] > http://lists.callweaver.org/mailman/listinfo/callweaver-users _______________________________________________ Callweaver-users mailing list [email protected] http://lists.callweaver.org/mailman/listinfo/callweaver-users _______________________________________________ Callweaver-users mailing list [email protected] http://lists.callweaver.org/mailman/listinfo/callweaver-users
