Voice over IP Design Considerations
Introduction
In the previous section, you learned about the configuration of a basic VoIP network. However, additional considerations are required. In this section, you examine various VoIP design considerations and are introduced to two additional voice-over-data technologies: Voice over Frame Relay (VoFR) and Voice over ATM (VoATM).
RTP
Consider the characteristics of IP networks. They are considered to be “connectionless,” meaning that the IP protocol by itself does not provide guaranteed packet delivery. Also, thanks to various routing protocols, IP networks can support multiple paths between a source and destination; this provides load balancing and fault tolerance.
Voice packets use a Layer 4 protocol, ...
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