How many PSTN trunks and DSP resources will be needed to support calls between IP telephones and the PSTN in the branch?

You are planning a branch location that requires Tl/El Public Switched Telephone Network (PSTN) trunks. There will be a peak hour usage of 1 PSTN trunk for every 20 of the 500 users.

How many PSTN trunks and DSP resources will be needed to support calls between IP telephones and the PSTN in the branch?
A . 31 PSTN trunks and 32 DSP resources
B . 25 PSTN trunks and no DSP resources
C . 25 PSTN trunks and 25 DSP resources
D . 26 PSTN trunks and 27 DSP resources

Answer: A

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