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Explanation: Trata-se do dispositivo que gera o som indicativo de chamada, no telefone. Veja este exemplo, em inglês:
Lucent - 3C1 Ringing Generator for Feat. Pack. B, B/SS, C, INA- ...
3C1 Ringing Generator for Feat. ... The 3C1 ringing generator provides 20-Hz negative-superimposed
ringing current to satisfy the ringing requirements of the RT. ... www.lucent.com/products/family/ 0,,CTID+2013-STID+10475-SOID+10-GPID+1302_3579-FMID+21473-LOCL+1,00.html