At 10:22 PM on 09 Sep 2009, John A. Sullivan III wrote: > Hello, all. I've come across a nasty problem just as we are ready to > put our first system into production. During our final testing, we > were plagued with several "invalid extension" or "password incorrect" > messages when we knew the information entered was correct. Upon > investigation, we saw that DTMF signals were occasionally but not > consistently duplicated. We might dial extension 1234, see 1234 on > the phone from which we dialed, but see 112334 on the Asterisk > console. > > We have seen this from cell phones calling via the PSTN (we use a SIP > trunking carrier and do not handle the PSTN interface ourselves); > we've seen it from land line phones via the PSTN, and have even seen > it internally from our own Snom SIP phones. > > dtmfmode=auto but we have also tried setting it to rfc2833 and we have > tried relaxdtmf set to both yes and no. > > We are running Asterisk 1.6.1.6 on CentOS 5.3. We really don't know > what more to do to fix it. Googling shows that others have had this > problem but I haven't seen a clear resolution other than playing with > relaxdtmf. How do we solve this problem? Thanks - John
When we had that problem, it turned out it was caused by the txgain being too high (10.0). I dropped it down to 5.0, and the DTMF problems went away. Have you tuned your gains using a milliwatt line and ztmonitor? I followed this howto: http://www.mattgwatson.ca/?p=14 But that led to the ridiculous txgain setting of 10.0 on all my ports, which I later clawed back to 5.0 to fix the DTMF issue. Maybe I did it wrong? Anyway, the rxgain settings I got from that procedure seemed to improve our call quality. We've since moved to a partial PRI instead of those analog lines, so we don't have to worry about that anymore. :-) -- C. Chad Wallace, B.Sc. The Lodging Company http://www.skihills.com/ OpenPGP Public Key ID: 0x262208A0
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