| With an outcome of Voice over IP telephony, 21st | | | | provided with varied support functions. Clients are |
| century bids an adieu to traditional public service | | | | offered hardware devices, monitoring call volume as |
| telephone network (PSTN). Unlike, optical fibres used in | | | | well as call quality from carrier VoIP services. While |
| PSTN, VoIP telephony works well on packet switching | | | | sitting in one office user can connect to all other |
| task of Internet to carry telephone calls. IP telephony | | | | offices through self owned private network, this is |
| allows users to carry global conversation at a lower | | | | made possible by IP telephony. |
| cost and with greater functional advantages from | | | | VoIP wholesale carrier service also deals in selling time |
| carrier services. Well, VoIP carrier saves user's | | | | on extensive network to other providers and to third |
| tremendous money on setting up infrastructure and | | | | parties. To expand connection all over the world, third |
| accessing long distance or international calls. | | | | parties provide pre-paid calling cards with affiliation to |
| Any business house venturing in VoIP carrier service | | | | other carrier services. This helps VoIP carrier services |
| requires its own network of VoIP gateway switches | | | | to make maximum use of their own network |
| that connects the users with public service telephone | | | | worldwide. |
| network (PSTN). Clients of VoIP carrier services are | | | | |