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).

A T1 local access connection to the Internet that can be configured to carry either 24 digitized data channels or one aggregated concatenated data channel at a rate of 1.544 Megabits Per Second (Mbps) that is connected via a T1 Wan Interface Card (WIC), Channel Service Unit / Data Service Unit (CSU/DSU), and Internet router.

Voice over IP is a digital phone service that allow users to make calls across the public switched telephone network (PSTN) via the Internet. By using a high speed Internet connection and a VoIP phone or analog telephone adapter (ATA), a user receives the same type of phone service as plain old telephone service (POTS) plus many additional features. For example, find me / follow me allow a user to enter all of the phone numbers the user wants to ring when the user's VoIP phone number is called. If you are at home, at the office, or on your mobile phone, all of your phones can be rung in succession or at the same time using VoIP!

The ADSL downstream receiving rate from the Internet usually varies from 1.5 to 9Mbps while the upstream sending rate usually varies from 16 to 640 Kbps.

Ethernet can be used to connect twisted copper pair networks and to connect fiber optic cable networks.

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.

Ethernet provides a great local access medum to connect LANs to the Internet and is quickly becoming the access method of choice were it is available.

DSL service is delverd as Asymmetric DSL (ADSL) which is the most common application for Internet access, where fast downstream is required, but slow upstream is acceptable, and as Symmetric DSL (SDSL) which supports high speed access across the local access loop in both directions.

High-speed microsave and satellite Internet connections for business can replace or back up traditional terrestrial landlines such as Internet T1s and Digital Subscriber Line (DSL) service. With wireless Internet service in place as your primary or backup Internet connection, you can always count on low-latency connection to the Internet that means you will have an "always up", "never down", "zero outage" service that eliminates wasted time and increases productivity.

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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.