SAA Probes Used for PSTN Fallback

When a call is attempted at the originating gateway, the network congestion values for the IP destination are used to allow or reject the call. The network congestion values for delay, loss, or ICPIF are obtained by sending an SAA probe to the IP destination the call is trying to reach. The threshold values for rejecting a call are configured at the originating gateway. Figure 8-14 illustrates this concept.

Figure 8-14 PSTN Fallback

SAA Probe sent across the IP network.

SAA Probe response. Congestions detected across the WAN; ICPIF or delay/loss exceeded threshold.

Figure 8-14 PSTN Fallback

SAA Probe sent across the IP network.

SAA Probe response. Congestions detected across the WAN; ICPIF or delay/loss exceeded threshold.

CallManager

Possible Destinations for Redirection

• Alternate IP Destinations

• Gateway Connection to PSTN

• Reject Call to PBX (ISDN) CallManager

CallManager

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