Saturday, September 13, 2008

Reliability

Conventional phones are connected directly to telephone company phone lines, which in the event of a power failure are kept functioning by backup generators or batteries located at the telephone exchange. However, IP Phones and the IP infrastructure connect to (routers and servers), which typically depend on the availability of mains electricity or another locally generated power source. Therefore, most VoIP networks and the supporting routers and servers are also on widely available and relatively inexpensive Uninterrupted Power Supply (UPS) systems to maintain electricity during a power outage for a predetermined length of time ranging from as little as an hour and up from there, depending on the quality of the UPS unit and the power draw of the communications equipment.

Voice travels over the internet in almost the same manner as data does in packets. So when you talk over an IP network your conversation is broken up into small packets. The voice and data packets travel over the same network with a fixed bandwidth. This system is more prone to congestion and DoS attacks[5] than traditional circuit switched systems.

To increase the reliability of VoIP phones the VoIP provider needs to increase dedicated and redundant connectivity via T-1 access and backup DSL, with automatic failover at each location.[6] The company can create a reliable network by reducing the number of single points of failure and providing it's own UPS or other backup power generators on site.

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