You can make calls through regular line using VoIP gateways and vice versa. When you make a call from the traditional telephone system, the gateway will translate the multiplexed voice or audio into a packetized voice sample. This voice sample available in packets is attached to the Internet Protocol packets and they are then transmitted.
You can rely on Singtel for choosing the best IP phone Singapore. We have been offering our services for a long time and assure you the best pricing for our services as well as our support. You can let our technicians assess your requirements and then give the suitable recommendation.