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Subject: Re: dial tone, calling ring and busy signal detection

Date: 06/18/03 at 12:26 PM
Posted by: Beso
E-mail: beso_1981@hotmail.com
Message Posted:

In Reply to: dial tone, calling ring and busy signal detection posted by gilbert bautista on 11/26/02 at 6:45 PM:


after greatings i'm a student in school of engineering and i'm right now working in a project related to pbx and i'm in need to a circuit that generate the ringback tone , busy tone and ring tone.

so i'll be so happy if u help me in this sir

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