Go back to 300-070 - Implementing Cisco IP Telephony and Video, Part 1 (CIPTV1)

Question :-

After you configure a dial plan to call a particular prefix in the PSTN, you notice that some outbound calls are taking longer than usual (15 seconds) before you hear a connecting tone. What is the likely cause of this issue?
The outbound gateway must be configured with the new prefix.
The endpoint is choosing the best codec to use.
The new prefix is overlapping other route patterns.
With some prefixes, this is normal behavior of the PSTN.

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