How many calls does this link support if G.711 as the audio codec is used?

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A network administrator with ID392116981 has determined that a WAN link between two Cisco UCM clusters supports only 1 Mbps of bandwidth for voice traffic.

How many calls does this link support if G.711 as the audio codec is used?
A . 15
B . 16
C . 13
D . 12

Answer: D