[EMAIL PROTECTED] 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 levels
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. > #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 _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
