Based on my testings, The Gateways and Trunk also can use the SRLG.
For instance HQ and Branch 1, and CAC is configured between those phone. When the PSTN Phone dials the Branch 1 IP phone through the HQ Gateway, and there is not enough bandwidth, the calls is rerouted back to HQ gateway and then send to Branch 1 through PSTN (simple AAR). But the point is, that I have Route Patterns for PSTN dialing pointing to SLRG. So that the HQ gateway could select the correct Gateway based on its Device Pool for AAR calling through PSTN. Is it right? or I am missing something?
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