I have a client that is complaining that they are having trouble with Asterisk not reliably recognizing DTMF from some phones. The calls are being delivered by ATT & Qwest over PRI to te410p's with firmware that was upgraded about 10 months ago. Can I tweak the "amplitude" and duration of what Asterisk considers a keypress? (I'm in the US if it matters.) What will happen if I tweak too much? Can I measure the amplitude and duration of a keypress to help identify the phones? Thanks in advance, ------------------------------------------------------------------------ Steve Edwards sedwards@sedwards.com Voice: +1-760-468-3867 PST Newline Fax: +1-760-731-3000
You could try : relaxdtmf=yes in zapata.conf David -----Message d'origine----- De?: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-bounces@lists.digium.com] De la part de Steve Edwards Envoy??: 28 ao?t 2006 21:49 ??: Asterisk Users Mailing List Objet?: [asterisk-users] Can I increase DTMF sensitivity? I have a client that is complaining that they are having trouble with Asterisk not reliably recognizing DTMF from some phones. The calls are being delivered by ATT & Qwest over PRI to te410p's with firmware that was upgraded about 10 months ago. Can I tweak the "amplitude" and duration of what Asterisk considers a keypress? (I'm in the US if it matters.) What will happen if I tweak too much? Can I measure the amplitude and duration of a keypress to help identify the phones? Thanks in advance, ------------------------------------------------------------------------ Steve Edwards sedwards@sedwards.com Voice: +1-760-468-3867 PST Newline Fax: +1-760-731-3000 _______________________________________________ --Bandwidth and Colocation provided by Easynews.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
Steve Edwards wrote:> I have a client that is complaining that they are having trouble with > Asterisk not reliably recognizing DTMF from some phones. The calls are > being delivered by ATT & Qwest over PRI to te410p's with firmware that > was upgraded about 10 months ago. > > Can I tweak the "amplitude" and duration of what Asterisk considers a > keypress? (I'm in the US if it matters.) > > What will happen if I tweak too much? > > Can I measure the amplitude and duration of a keypress to help > identify the phones?Tweaking is almost never the answer. The DTMF detector will detect a wide range of mangled DTMF tones correctly. If it can't detect what you are receiving on a clean digital line, something serious is wrong. The likely candidates are: - You have frame slips, because your T1 is not clocked properly, or because your PCI bus is not keeping up. The DTMF detector was modified to be somewhat tolerant of hiccups in the data, but it can still be fooled, especially if a big chunk of audio goes missing. - You have the gain turned up so far, the signal is clipping. It sounds like that shouldn't be an issue, since if the DTMF clips the voice must sound awful. Well, I get regular wave files sent to me where the gain *is* set that high, and people say the voice has no problem. - People are using really really crappy phones. There are quite a few phones that just never dial reliably. Its hard to see why people put up with them, but they do. Steve