No ringback tone, CRBT, or beep tone when I make a call

Problem:

When a subscriber makes a call, he or she does not hear the CRBT, ring-back tone, or beep tone before the call is connected.

Cause:

The ring-back tone of the call is delivered by the carrier's network. If the ring-back tone (including the CRBT) is not heard during the call, the issue is caused by the carrier's network.