Trai mandates minimum call ringer duration of 3...

Trai mandates minimum call ringer duration of 30 seconds

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Trai mandates minimum call ringer duration of 30 seconds

Trai mandates minimum call ringer duration of 30 seconds

https://economictimes.indiatimes.com/industry/t...

TRAI fixes ring timings for mobiles, landlines

https://www.thehindu.com/business/Industry/trai...

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