When does my phone ring??

Edwards Finance > Phones

Q. As the title suggest, I am trying to find out when my phone rings. By this I mean, does my phone ring at the same instant that the caller hears a ring, or do they hear the ring before I do? (Or do I hear a ring before them?) The call would be coming from a POTS line, onto a T-1 800 line.

A. The ring the caller hears has nothing to do with the ring the called party hears. Two different pieces of hardware are used. My experience has been that the ring the callers hears is exactly the ring the called party hears. It is technically so and is the reason why when you call a country with a different ring cadence, you hear that cadence instead of your normal ring cadence. On local calls, the timing is exactly the same i.e. you hear the ring at the same time the ringging current is sent to the called party's telephone. Actually, the correct answer is, "it depends". The terminal equipment, CO or PBX if DID, is responsible for both ringing to the device and ringback to the caller. It may be the same piece of equipment, and the ringback and ringing identical, or it may be totally different pieces of equipment and the ringing and ringback different. Proof of this is when you call a PBX with distinctive ringing that indicates the source of the call to the called party. (One ring - internal call, two rings - external, etc.) When you call from outside one of these PBX's, you will usually hear a "normal" one ring ringback, even though the called party hears two rings. In the old days of telephony, before electronic switiches (ESS, GTD) the ring signal you heard on your phone was the same as the ring the caller heard. This was the way it was on the Step and Crossbar switches. The ring generator was just that, a DC powered generator. the Generator ran all the time and had relays to time the on and off cycles. I tryed it with my phone I have two phone lines in my home, sometimes it is the same the first time I tested it the the ring was a little bit behind the other another try they were completly different so I think it works randomly. What you hear may be coming from the distant end office, explaining the different audio from different areas. But since the several phones in my house actually ring at slightly different times, I can be positive that the calling party isn't hearing _exactly_ the same ring timing as I, since he has at least three to chose from.

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