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Argh - ATA problems. |
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Join Date: Dec 2001
Posts: 14
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Argh - ATA problems.
Anyone got any clues with ATA & PSTN problems?
I have a Handytone 488. I can sign onto a SIP service, and make calls. It has a PSTN passthru - I can receive PSTN originated calls. I cannot, however, make PSTN outgoing calls. It drops a connected call after about .5 a second. Bizarrely, if I connect the outside line, and ring "***", I hear the Telewest wench saying "The number you called" etc, perfectly fine. If I connect outside and ring 123, and it picks up, one end drops the call. SYSLOG from the first example (in reverse order) : 1367DAA Hangup 2 FXO killcall 0 1 33251 0 1367DAA Hangup 4 1350DAA Pickup 2 SYSLOG from the second example (in reverse order) : 1367DAA Hangup 2 (I hangup handset here) 1367DAA Hangup 2 FXO killcall 0 1 0 0 1350DAA Pickup 2 Something (killcall) kills the call, and I see a Hangup "2" rather than a "4". I also see another "2" when I actually disconnect the handset. I suspect this is something to do with voltage and impedance. Port FXS (the handset) has the following options : Onhook threshold : 800ms FXS Impedance : UK/New Zealand #2 (370 Ohm + 620 Ohm||310nF) Onhook Voltage : 36V Polarity Reveral : NO Port FX0 (the line, connected to Telewest) has the following options : PSTN AC Termination : 370 Ohm + (620 Ohm || 301nF) Now, the Telewest FAQ says (on Network Termination Impedance) : The impedance necessary to satisfactorily terminate the Telewest network interface at the NTP so as to prevent instability is represented by a three-element network consisting of a 620 ohm resistor in parallel with a 310 nanofarad capacitor, both in series with a 370 ohm resistor. My FXS Impedance matches this. My handsets are cordless DECT, but I have tried with a wired handset. No difference. Any useful clues? Anyway, as a result, I can't currently make outgoing calls - but we can receive them... |
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