One of the advantages of VoIP is that voice and Internet services are delivered over the same local loop access circuit using the Internet Protocol (IP).
An Internet T3 (also spelled Internet T-3) is a broadband Internet connection that transfers signals at a rate of 45 Mbps. Both Internet T1 and T3 services are highly-reliable circuits that are usually guaranteed by a Service Level Agreement.
Many VoIP service providers guarantee that phone calls will not travel over the public Internet, but are converted and transmitted over the traditional telephone network directly from the VoIP provider's private Internet network that usually adheres to a defined Quality of Service (QoS).
Representative Telecommunication Services: We offer VoIP PBX, IP PBX, US termination, SIP gateway, VoIP gateway, data and Internet T1 (DS1) lines (1.5 Mbps bi-directional transfer upload and download rate), fractional T1 (DS1) circuits (256 Kbps to 1,024 Kbps), bonded (load balanced) T-1 (DS1) lines (3 Mbps to 12 Mbps), T3 (DS3) lines (6 Mbps to 45 Mbps), point-to-point private lines, Virtual Private Networks (VPNs), MPLS (Multi Protocol Label Switching), wide area network (WAN) configurations, inbound and outbound call center services, IP PBX and Hosted VoIP solutions, dynamic and channelized integrated T1 (DS1) lines, Primary Rate ISDN (PRI) service, etc.
The main limitation on DSL bandwidth speed is the distance from the customer premise to the local telephone company central office.
MPLS VPNs use Multiprotocol Label Switching (MPLS) to set up Virtual Private Networks (VPNs) that can isolate data traffic to provide Class of Service (CoS), Quality of Service (QoS), and ease network administration with minimal network overhead. Layer 3 MPLS VPNs (L3VPNs) use BGP, traffic isolation and Virtual Routing / Forwarding (VRF) for network routing and security. MPLS VPNs are more efficient and robust than IPSec VPN, ATM, MPLS L3VPNs.
The wide-spread use of Ethernet has reduced the cost of Ethernet switches and also the space required to deploy Ethernet networks either via twisted pair copper or fiber and virtually all computer manufacturers include an Ethernet card as a standard component on Personal Computer (PC) motherboards which eliminates having to install an Ethernet card as a peripheral device.
DSL has become a widely-accepted and increasingly reliable method of delivering phone service and providing Internet access that saves end users money because both voice and data are delivered across the same plain old telephone serivce (POTS) line. However, the distance to the local phone company central office where the copper POTS line is connected from the customer premise to the DSLAM will determine the potential speed of the DSL connection.
You can compare MPLS to Frame Relay and ATM technologies.
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MPLS can be used to create highly-scalable IP networks with layer 2 level security as well as easy network configuration, management, and provisioning.
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