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What, if any, are the benefits gained by using VoIP over VoFR?

What, if any, are the benefits gained by using VoIP over VoFR? We have experienced intermittent voice problems on VoFR. Will VoIP solve this problem and can it (VoIP) be seamlessly integrated with IP applications with priority queueing and QOS on routers?
A properly configured voice over frame relay network should provide good performance, so it is important to understand the nature of the intermittent voice problem and what is causing it. Your service provider or the device equipment manufacturer may be able to assist you with troubleshooting this problem.

Whether you're using VoFR, VoATM, or VoIP, if devices in the network are not properly configured, you can experience problems with voice quality. Also, if there are large delays or the available bandwidth is overwhelmed, there will be problems with voice quality. With VoIP devices, you can typically configure IP level QoS (e.g., IP Precedence, IP Tos, or DiffServ). This can help to prioritize delay sensitive traffic such as voice and video over data traffic.

You really have to look at your bandwidth utilization and understand the maximum amount of bandwidth you wish to use for voice traffic. For a VoIP call using compressed voice (G.729a), the approximate bandwidth used (one way) is 24 kb/s (including Ethernet and IP overhead). For a VoIP call using uncompressed voice (G.711), the approximate bandwidth used (one way) is 87 kb/s (including Ethernet and IP overhead). This will help you to understand what type of broadband service plan you need.

This was last published in January 2005

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