On an IP 500 control unit that has 12 DS30 modules configured, what is the maximum number ISDN/PRI trunks that can be configured?

On an IP 500 control unit that has 12 DS30 modules configured, what is the maximum number ISDN/PRI trunks that can be configured?
A . 6
B . 3
C . 4
D . 8

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Answer: A