RAI in Enterprise Networks

RAI is generally less applicable in enterprise networks than in SP networks because there is often only one gateway at each site, as shown in Figure 8-18. This is almost always true for the typical hub-and-spoke enterprise network. Even at the large sites, there may be multiple T1/E1 trunks to the attached PBX, but there are seldom multiple gateways.

Figure 8-18 Enterprise VoIP Network Topology

Figure 8-18 Enterprise VoIP Network Topology

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If a single gateway is used to terminate a call, where the called user resides on a specific PBX and is reachable only through a specific gateway in the network, RAI does not provide additional network intelligence. With no alternate gateway to handle excess calls, a call will always fail whenever the single terminating gateway is too busy. In addition, in enterprise networks the probability of congestion is typically higher in the IP cloud than in the number of terminating POTS trunks. In the SP networks discussed earlier, congestion is more common in the terminating POTS trunks than in the IP cloud.

In spite of these limitations, RAI can still be used for enterprise networks provided the gateway to PBX connections at the remote sites consist of T1/E1 trunks. If a terminating gateway is too busy, it triggers a PSTN reroute instead of selecting an alternate gateway as in the SP network situation.

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