Which of the following methods is most commonly used to remove echo in telephone networks these days?

Minimum bandwidth required for VoIP to deliver high quality services?

Which statements regarding CRTP is/are false?

According to the ITU standard G.114, what is the maximum delay acceptable for high quality voice?

Which protocols are assigned ports for each voice call?

Which classes are used for host addressing?

Which are true regarding circuit-switched networks (POTS) and packet-switched networks?

Which protocol is used in a VoIP call at the application layer of the TCP/IP model?

QSIG is implemented on PRI interfaces only.

Which one has the correct sequence (from the lowest layer to the highest)?

Reason for using UDP instead of TCP for voice transmission?