Oops! I missed the part where you said you use a SIP trunk. My experiences and comments are entirely irrelevant to your case. Sorry!
At 12:02 PM on 10 Sep 2009, C. Chad Wallace wrote: > > 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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