Through which protocols can VPNs be implemented at layer 2?

VoIP runs only on the internet. It cannot run on any other network.

Which are examples of CCS?

Which device is used to physically connect all network devices like PCs, IP phones etc. to the LAN?

Which are ITU standards for voice compression?

Three main steps required in the analog-to-digital conversion process?

Which are the major VoIP protocols?

One of the most important things common in all IP phones?

Components of local loop signaling?

Range of the frequency of a telephone channel?

Most common trunk signal type used by E&M signaling?