Answer:
3.1 Mbps
Step-by-step explanation:
Voice comes in 8000 Hz frequency, so 16000 samples required each seconds.
1 sample if of 8 bits.
16000 sample if of 128000bits.
these bits is send per second.
so bandwidth required is 128kbs for single voice.
for 24 it is 24 x 128 kbps
= 3072 kbps
= 3.1 mbps