When I make a call with an android smartphone, how can I detect (event, class, etc) the moment when the smartphone (caller) has responded (dial tone)?

Orestes Gabriel Pérez @Orestes-Perez

07 April 2015 1 7K Report

A dial tone is the telephony signal sent by a telephone exchange, It indicates that the exchange is working.

Orestes Gabriel Pérez

karen appreciate your answer, but I need that detection be only with the Smartphone devices's

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