This model uses the Public Internet to place and receive telephone calls. This method typically costs a fraction of traditional voice services that utilize the public switched telephone network. The downside to routing calls over the Internet is the loss of end-to-end control over the call. Depending on factors such as bandwidth and congestion, this model can result in lower quality voice transmission than calls placed on traditional land-lines. The technologies used in this model continue to improve quality, but at this time providers do not guarantee it.
This model uses VoIP within your business network. The VoIP traffic does not leave your building/office unless you have a secondary building/office that is on the same network. This model provides the features of VoIP without the risk of impaired voice quality associated with using the Public Internet to complete a call. Quality can be guaranteed because the VoIP traffic is transmitted and received within a controlled environment.
This model can be considered an extension to the In-house VoIP model described above. VoIP services within your network are extended to transmit your VoIP traffic over a dedicated private connection to the provider’s data center. Once the VoIP traffic reaches the provider, it is converted to traditional TDM technology and uses the public switched telephone network to complete the call. This model combines some of the cost savings associated with Public Internet service offerings while guaranteeing voice quality.