Hi all, Several months ago we built an * box with a quad-FXO tdm400p (REV e/f).>From the get-go, there has been a problem where occasionally (2-3 timesa week) zaptel/* will not detect the ringing on a line. (The call will ring through to telco voicemail). The problem is not specific to a single line or FXO port on the tdm400p. I have 2 theories: #1 - the ring voltage for some calls is below acceptable levels #2 - the tdm400p card is bad Assuming #1, can the zaptel driver be tweaked to be more sensitive to ringing? Any other ideas or experiences? Running asterisk/zaptel v1.0.2 Thank you, -- Ryan Courtnage Director & CTO Coalescent Systems Inc 403.244.8089 www.coalescentsystems.ca
Ryan Courtnage wrote:> zaptel/* will not detect the ringing on a line. (The call will > ring through to telco voicemail).> Any other ideas or experiences?Is the telco voicemail the only evidence you have that this is happening, or have you "seen" it happen? Just wondering if there could be a problem with an engaged line causing calls to go to telco voicemail, rather than overflowing to the next line?
asterisk-users-bounces@lists.digium.com wrote:> Hi all, > > Several months ago we built an * box with a quad-FXO tdm400p > (REV e/f). >> From the get-go, there has been a problem where occasionally > (2-3 times > a week) zaptel/* will not detect the ringing on a line. (The > call will ring through to telco voicemail). > > The problem is not specific to a single line or FXO port on the > tdm400p. > > I have 2 theories: > > #1 - the ring voltage for some calls is below acceptable levelsPossible, but also possible that there is too much loss on the circuit. You can test the ringing voltage with a meter, it needs to be between 90V and 110V. Beyond that you may need to use a transmission test set (such as a Wilcom T136B). I got mine for $20 bucks on eBay. Using a butt set and the test set you'll need to call a 1004Hz source from TELUS and then check that you're within the following specs: Loop mA: 23 or better (too hot is no good either, but I doubt that's your problem) Circuit loss: between 0 and -8dB. 0 is really too hot, -3 to -6 is nominal, -8.5 is pushing it, but still within spec.> #2 - the tdm400p card is bad > > Assuming #1, can the zaptel driver be tweaked to be more sensitive to > ringing? > > Any other ideas or experiences? > > Running asterisk/zaptel v1.0.2 > > Thank you, > >http://lists.digium.com/mailman/listinfo/asterisk-users
Ryan Courtnage wrote:> On Thu, 2004-02-12 at 03:14 -0500, Jim Van Meggelen wrote: >> Possible, but also possible that there is too much loss on the >> circuit. >> >> You can test the ringing voltage with a meter, it needs to be >> between 90V and 110V. >> >> Beyond that you may need to use a transmission test set (such as a >> Wilcom T136B). I got mine for $20 bucks on eBay. Using a butt set and >> the test set you'll need to call a 1004Hz source from TELUS and then >> check that you're within the following specs: >> Loop mA: 23 or better (too hot is no good either, but I >> doubt that's your problem) >> Circuit loss: between 0 and -8dB. 0 is really too hot, -3 to-6 is>> nominal, -8.5 is pushing it, but still within spec. > > This is excellent feedback. I will certainly froogle for one of > those test-sets. > > Do you use Telus, and can you disclose their their test > numbers (ie: 1004Hz source, others)?I used to work for TELUS, but not on the carrier side, so I don't have access to that sort of information. I'm based in Ontario, so I know more about those resources with Bell Canada. Check out http://www.hackcanada.com/. They claim TELUS is their local carrier (http://www.hackcanada.com/telco/index.html), and since there's no love there they're willing to give up all kinds of interesting information. Let me know how it turns out - I'll help however I can. Cheers, Jim.