The voice port will be looked at first (inbound) or last (outbound) depending on the call flow. If your call flow is fairly simple you may have a situation where the telco is sending everything 4 digits but you need everything to be 10 digits or even +E164. In this case you could put a profile on the voice port changing everything from 4 digits to +E164. You could also do the same thing on the dial-peer. In my experience if your setup is fairly simple, just do it on the voice port. You will overcomplicate things on the dial-peer.
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