> Hello all, > > Everyone has probably experienced this at some point in the past: > You pick up your analog phone. Rather than hearing dialtone, you are > connected with someone who has just called you. Neither you nor them > heard a ring.
I don't think this is a freak incident at all. It still happens to me with people I call frequently and is easily explainable. you make a call, the telco connects it, and before the ring generator comes into a phase of putting voltage on the line, they pick up the phone. The circuit was connected, it just never got a chance to ring, there is nothing freak about it, just a matter of timing. This same thing could apply to asterisk or any other pbx or telco system since they all use the same basic arrangement of connecting circuits and ringing them. There is no hard and fast rule I know of that says a line must ring at least once before the called station can go off hook. Modems and such can be programmed with this rule, but a person picking up can do so at any random time. An exception would be when there is more than one call path to a phone, and effectively picking up to dial is not the same as picking up to answer an incoming call. Also, this could start happening more, not less as technology progresses since something like camp-on would have higher odds of hitting this situation since it constantly retries the number instead of the randomness at both ends if humans are involved. > > Maybe it's just me, but it seems these "freak incidents" would occur > more frequently years ago, than now. > > I've now experienced this a couple of times with an * system (TDM400p > - quad FXO): > A SIP exten dials digits which are answered by a Zap trunk. As soon > as Zap answers, the SIP extension is connected with an inbound (PSTN) > caller (who was expecting to hear an IVR). > > My questions are: Who's to blame (telco, tdm card, * config, > gremlins)? Is this avoidable? > > Thanks > Ryan > > _______________________________________________ > 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 > > !DSPAM:4277a74f32083462913418! > > Jon Pounder _/_/_/ _/ _/ _/ _/_/_/ _/ _/ _/_/_/_/ _/ _/_/ _/ _/ _/ _/_/ _/ _/_/ _/ _/ _/_/ _/ _/ _/ _/_/ _/ _/_/_/ _/ _/ _/_/_/_/ _/_/_/ _/ _/ _/_/_/_/ Inline Internet Systems Inc. Thorold, Ontario, Canada Tools to Power Your e-Business Solutions www.inline.net www.ihtml.com www.ihtmlmerchant.com www.opayc.com _______________________________________________ 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
