In a message dated 11/8/99, Gaston Cloutier writes: > In North America, to charge for a conversation (public payphone), the > beginning of the conversation is indicated by battery reversal (RBA). > I heard that in Europe to meter a conversation, there is billing tones (12 & > 16 KHz) .
Gaston: I believe that Dick Shultz' response pretty much covers what I could tell you about finding specifications for billing tones. The ETS 300 001 document has a good summary in Chapter 9, clause 9.2. While I am familiar with the application of billing tones on residential lines in Europe, I am less familiar with the possible use of billing tones for public pay phones. In the past I have heard occasional references to this possibility, but I have never been able to confirm that 12 KHZ and/or 16 KHz billing tones are used for public pay phones. If you or anyone else on treg have information on how public pay phone billing is handled in Europe (whether with billing tones or otherwise), I would be interested to hear about it. I have had a couple of clients ask me to include billing tone capability in SLIC circuits that I designed, because the client believed that billing tones are used to interoperate with public payphones. I would like to know more about how public pay phones operate in Europe, but I have not been able to locate suitable documentation. Joe Randolph Telecom Design Consultant Randolph Telecom, Inc.
