The SIP trunking services and VoIP access market has maintained its pace to become the default source of connection between on-site consumer platform and the PSTN (public switched telephone network). They are also expected to hold their stance prominently in supporting the efforts of a large number of revolutionary businesses towards digital transformation. The next generation voice access services include: Basic VoIP Access Services: These are congregated access lines linking with basic low-end structures or primarily with telephony endpoints usually via ATAs (analog telephone adapters). VoIP Trunking: These are joined access lines linking through TDM (time division multiplexing) enterprise telephony...